Resources

Dictionaries – General

Online

One of the strengths of online dictionaries, other than not taking up shelf space, is that they are updated as new words enter the English language. One of the weaknesses is that they rarely offer every word or definition. Many dictionaries, however, offer subscription services so you can access online all their content.

The Oxford English Dictionary – The OED is the finest, most comprehensive dictionary of the English language. By subscription only. Most large library systems offer full subscription access.

You will also find useful the more broad Oxford Dictionaries, where you can search all their modern English dictionaries and thesauruses, and the Oxford Reference, which gives you access to many dictionaries, thesauruses, the World Encyclopedia, and a number of other references covering subjects from languages to physics.

Dictionary.com – Includes notes on usage. Thesaurus and reference searches also available.

Merriam-Webster Dictionary – A good, basic resource for definitions, usage, and hyphenation. Includes a thesaurus and medical terminology.

Print

Oxford English Dictionary, 2nd edition, 1989 – The current edition of the OED fills twenty volumes plus additional volumes and supplements (to keep it up to date). It examines the origins of words and the evolution of their meaning and use over time. I don’t know any other dictionary in which you can find the difference between “use” and “utilize” or between “need” and “require.” Also available on CD. For more information, see the Wikipedia article.

Merriam-Webster’s Collegiate Dictionary, 12th edition, 2025 – Merriam-Webster is the standard reference (for spelling, usage, and hyphenation, punctuation of abbreviations, and capitalization) for most major style guides. For more information, see the Wikipedia entry.

Random House Webster’s College Dictionary, 2000 – Also available as an e-book.

The American Heritage Dictionary of the English Language, 4th edition, 2000

Thesauruses

Online

Thesaurus.com – Includes not only synonyms and antonyms but a discussion of the usage of the synonyms. Many of the synonym’s thesaurus entries are also included on the results page.

Merriam-Webster Dictionary Thesaurus – Not as extensive as the one at Thesaurus.com but better than many and, if you’re using the online dictionary anyway, quite handy.

Print

Roget’s – A number of versions are available, including Roget’s 21st Century Thesaurus (which I prefer), Houghton Mifflin Roget’s II and Roget’s International Thesaurus (which I find difficult to use). For more information, see the Wikipedia article.

Style Guides – General

The Elements of Style, by William Strunk Jr. and E.B. White – Available online, as a PDF file, and in a new (2016) printed version. This book’s small size belies the richness of the information within. It’s the third book on my reference shelf and the third most used (after the dictionary and the Chicago Manual of Style). It’s an easy read; I recommend perusing it once a year to refresh yourself on the basics.

Strunk and White, as it is often called, is not the extensive style guide that The Chicago Manual of Style or the AP Stylebook are. But it covers the basic use of the English language in a no-nonsense, concise manner.

The Chicago Manual of Style, 18th edition, 2024 – Widely used for many types of writing; extensive and comprehensive. Also available online by subscription.

A quick guide to its citation style can be found on the manual’s website.

The CSE Manual: Scientific Style and Format for Authors, Editors, and Publishers, 9th edition, 2024 – Published by the Council of Science Editors. The standard style reference across the sciences; most specialized scientific style guides defer to the CSE manual for issues they don’t address. Available as both a printed book and online.

A quick guide to 9th edition CSE citation styles is available here.

*The 8th edition (2014), titled Scientific Style and Format: The CSE Manual for Authors, Editors, and Publishers, remains widely used and is now fully available online.

AP Stylebook, 2024–2026 – The Associated Press stylebook is used particularly for journalism. Also available online by subscription.

The MLA Handbook, 9th edition, 2021 – Published by the Modern Language Association of America. Used for academic writing.

A Manual for Writers of Research Papers, Theses, and Dissertations, 9th edition, 2018 – Also called Turabian style, after its original author, Kate L. Turabian. Published by the University of Chicago Press.

A quick guide to citation and references styles can be found on the manual’s website.

Publication Manual of the American Psychological Association, 7th edition, 2020 – APA Style is commonly used for academic writing, particularly the social sciences. It’s an excellent and easy-to-read reference for reporting on the social sciences and any statistical data.

U.S. Government Printing Office Style Manual, 2016, available as downloadable text or PDF files.

Style Guides – Specialized

Microsoft Manual of Style, 4th edition, 2012 – Widely used for software and application documentation. This book is out of print, but it is excellent for interface documentation. If you can find a good used copy, I highly recommend this.

ACS Style Guide, 2020 – From the American Chemical Society. Used by the physical sciences, including physics.

AMA Manual of Style, 11th edition, 2020 – Published by the editors of JAMA (the Journal of the American Medical Association) and the Archives Journals. Used for medical writing. Also available online by subscription.

The AMA also has a blog, the AMA STYLE Insider, that addresses AMA style issues and questions.

Guide for the Use of the International System of Units (SI), 2008 – From the National Institute of Standards and Technology (NIST). This is available as a PDF. NIST also has an online reference.

The Bluebook: A Uniform System of Citation, 22nd edition, 2025 – The standard legal citation guide used by law students, lawyers, judges, and legal scholars throughout the United States. Available in print and online.

Others

There are a number of other specialized style manuals such as

Standards

The American National Standards Institute (ANSI) – These include International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) standards.

ASTM International (originally known as the American Society for Testing and Materials)

The Institute of Electrical and Electronics Engineers (IEEE) Standards Association

The National Institute of Standards and Technology (NIST)

The Society of Automotive Engineers (SAE) International

The American Petroleum Institute (API)

References – General

Check your local libraries for online access to encyclopedias and other reference books. For instance, my local library offers online access to Funk & Wagnalls New World Encyclopedia, the American Heritage Dictionary, and the World Book online reference center. The larger Denver Public Library offers online access to Funk & Wagnalls New World Encyclopedia and the Oxford English Dictionary. Both also offer access to a number of more specialized online references as well as databases of popular, academic, and professional articles.

Wikipedia can be an excellent source of information. They have recently become even more careful about maintaining only information that can be verified against reliable published sources.

Online reference sites such as Infoplease.com can be useful too. It provides access to almanacs, an atlas, a dictionary, and an encyclopedia.

References – Specialized

Most professional organizations offer an online page of useful, relevant reference sources. These are just a few general ones I use the most.

NIST’s “Weights and Measures” page

The American Society for Indexing’s “Reference Shelf”

Earth Sciences and related

The USGS Publications Warehouse

One particular USGS site I use a lot for topographical maps is topoView. Another is MapView, which gives you access to decades of geological maps reports for any specific area of interest.

State geological surveys are an invaluable and often overlooked resource for maps, geological reports, geochemical datasets, water resources data, and more. Most states maintain their own survey, and the quality and depth of available resources can be remarkable; the Association of American State Geologists maintains a directory linking to all of them.

I sometimes spend hours online poring over maps, geological reports, and other resources on the New Mexico Bureau of Geology & Mineral Resources and Arizona Geological Survey websites.

Artificial Intelligence (AI)

I hesitated to include a section on AI, because this is just as likely to be outdated within a month as within a year. But in hopes that some resources might help someone, I want to include a few.

Co-Intelligence: Living and Working with AI, 2024, by Ethan Mollick. This book is already 2 years old, and in terms of AI development, it’s nearly ancient. However, Mollick does a fine job of explaining the development and the essence of AI, particularly LLMs. I highly recommend this book for anyone getting started with AI.

Tom Johnson’s I’d Rather Be Writing website and blog. Tom Johnson writes extensively and thoughtfully about AI’s impact on technical communication, prompt engineering for tech writers, and the evolving role of the profession.

The Prompt Engineering Guide website. A comprehensive, well-maintained open resource on prompt engineering.

The Learn Prompting website. Includes a free, 60-module beginner’s course. Geared towards ChatGPT users, but more broadly applicable.

ADA (The Americans with Disabilities Act) Accessibility

In April 2024, the U.S. Department of Justice issued a final rule under Title II of the ADA requiring state and local governments to make their websites, mobile apps, and publicly available documents—including PDFs, Word documents, PowerPoint presentations, and spreadsheets—accessible to people with disabilities, in conformance with the W3C’s WCAG 2.1 Level AA standard. Federal agencies and their contractors are subject to similar requirements under Section 508 of the Rehabilitation Act. Compliance deadlines, currently set for 2027 and 2028 (depending on the size of the entity), have already been extended once; private-sector organizations face similar pressure under Title III of the ADA, and courts have increasingly applied accessibility requirements to private websites as well.

The DOJ fact sheet “New Rule on the Accessibility of Web Content and Mobile Apps Provided by State and Local Governments”

W3C’s Web Content Accessibility Guidelines (WCAG) 2.1

W3C’s Web Accessibility Initiative. This site has more practical implementation guidance than the raw WCAG specification (above) alone.

Section508.gov. Federal guidance including specific resources for accessible PDFs and other document types.

WebAIM: Web Accessibility in Mind. Practical, accessible guidance on web and document accessibility, including a free contrast checker.

Grammar, Punctuation, and Usage

Print

Grammar is the rules about using different types of words, phrases, and clauses and how those are put together to form sentences. Punctuation is the “road signs” that help readers correctly interpret words, phrases, clauses, and sentences. Usage addresses how words or phrases should and should not be used.

Many style guides have sections on grammar, punctuation, and usage.

The Elements of Style, by William Strunk Jr. and E.B. White – Available online and as a PDF file, but I recommend buying a printed copy. Covers the most important basics of grammar, punctuation, usage, and good writing.

The Oxford Dictionary of English Grammar; 2014.

The Cambridge Grammar of English: A Comprehensive Guide; 2006.

Fowler’s Dictionary of Modern English Usage, by Henry W. Fowler, later updated by R. W. Burchfield; 2015 – Widely regarded as the finest English usage guide. Covers both American and British English. For more information, see the Wikipedia article.

Modern American Usage: A Guide, by Wilson Follett, revised by Erik Wensberg; 1998 – Another highly recommended usage guide. For more information, see the Wikipedia article.

Merriam-Webster's Dictionary of English Usage; 1994

The American Heritage Book of English Usage, 1996

Online

The Purdue OWL – A superb resource that covers writing, grammar, and citation styles, among other useful help.

GrammarBook.com – Covers grammar and punctuation and some usage and style issues.

I often refer to posts by Grammar Girl Mignon Fogarty on her website, Quick and Dirty Tips.

You might also find useful Paul Brians’ Common Errors in English Usage.

Wikipedia has a decent entry on “English grammar” that includes a list of grammar books and useful links.

Writing and Editing

General

On Writing Well, by William Zinsser, 2016 – This is, I believe, the finest book on writing. It’s easy to read and full of guidance, stories, and examples that will inspire you to write better.

In 2009, Zinsser wrote an article, Visions and Revisions, about writing On Writing Well and keeping it up to date for 35 years. He also wrote a weekly essay, Zinsser on Friday.

The Subversive Copy Editor, 2nd Edition, 2016. A highly recommended book on editing and also a very pleasant and useful read.

Technical Communication

There are probably at least a hundred technical communication books or books useful to technical communicators and I certainly have not read all of them! In addition, different books are useful for different levels and different kinds of professionals. Moreover, other people have already put in a great deal of effort to research and compile lists, and I probably couldn’t improve on their hard work. Here, then, are some links to sites with useful lists:

Ken Hanson’s “Help with Technical and Scientific Writing” – Includes a number of online resources and articles.

I’d Rather Be Writing’s “40 Foundational Books for Technical Writing”

Three books I recommend:

Technical Writing: A Comprehensive Resource for Technical Writers at All Levels, 2011, by Martinez, Peterson, Wells, Hannigan, and Stevenson

Managing Your Documentation Projects, 1994, by JoAnn T. Hackos

Writing White Papers: How to Capture Readers and Keep Them Engaged, 2006, by Michael A. Stelzner

“The Science of Scientific Writing,” by George D. Gopen and Judith A. Swan, originally published in the November-December 1990 issue of American Scientist.

KOK Edit’s “Copyeditors’ Knowledge Base” – A comprehensive list of resources compiled by Katharine O’Moore-Klopf.

ESL and/or Translation

The Elements of International English Style, 2005, by Edmond H. Weiss – Writing for international audiences is becoming an increasingly important skill, and this book is an excellent guide to the reasons for and the details of such writing.

Project Management

The Project Management for the Unofficial Project Manager, Updated and Revised Edition, 2024. A short, useful book for managing projects, emphasizing leading people and managing projects. Includes the basics of PMI project management principles.

The PMBOK Guide: A Guide to the Project Management Body of Knowledge, 8th Edition, 2026.

HTML, CSS, & Other Web Design Resources

I have created a separate page for web-specific resources.

Organizations

The Society for Technical Communication

The Society for Technical Communication closed at the end of 2025 after more than 70 years. It was an invaluable resource and community for technical communicators, and its loss is felt across the profession. Its archived Ethical Principles remain an excellent reference.

The Editorial Freelancers Association

The EFA has an excellent “Editorial Rates” page.

The National Association of Independent Writers and Editors

The NAIWE has a good blog, NAIWE NewsWire, with useful articles for writers and editors.

The American Medical Writers Association

The Boulder Writers Alliance – The BWA is a local organization for communications professionals but it’s an excellent group and resource.

The Council of Science Editors

The Institute of Electrical and Electronics Engineers (IEEE) Communications Society, or ComSoc

The National Association of Science Writers

The American Geosciences Institute (AGI)

The International Union of Geological Sciences (IUGS)

The Society of Petroleum Engineers (SPE)

The Society of Professional Journalists

I particularly like SPJ’s Code of Ethics.

If you really care about quality journalism, you may be interested in Investigative Reporters and Editors, which promotes quality investigative reporting.

The American Society for Indexing

The Project Management Institute

KOK Edit’s website has an extensive list of relevant organizations on its “Networking” page.