The American Heritage Dictionary of the English Language, Fourth Edition. Houghton Mifflin . Boston . 2009. An online edition is accessible free of charge through http://www.thefreedictionary.com/.
Merriam–Webster Online. http://www.merriam-webster.com/. There is no charge for access to a basic, abridged version. Access to the unabridged version is available at $US 30 per year.
The New Oxford American Dictionary, Second Edition. Oxford University Press . 2001.
The Oxford American Dictionary of Current English. Oxford University Press . 2002.
The Oxford Dictionary of American Usage and Style. Oxford University Press . 2000.
http://www.computeruser.com/resources/dictionary/index.html.
http://webopedia.internet.com/.
A Dictionary of Computing, Sixth Edition. Market House Books . 2008.
A Dictionary of the Internet. 2009.
AP Stylebook. The Associated Press . New York . 2009. Online version available at http://http://www.apstylebook.com — subscription $US 25 per year.
Publication Manual of the American Psychological Association, Sixth Edition. American Psychological Association . Washington DC . 2009.
The Chicago Manual of Style, 15th Edition. The University of Chicago Press . Chicago . 2003. Online version available at http://www.chicagomanualofstyle.org/home.html — subscription $US 30 per year.
MLA Handbook for Writers of Research Papers, Seventh Edition. The Modern Language Association of America . New York . 2009. Available from http://www.mlahandbook.org for $US 22, which includes access to the online version of the guide for the lifetime of the Seventh edition.
Working With Words: A Concise Handbook for Media Writers and Editors, Third Edition.. St. Martin's Press . New York . 1997.
Apple Publications Style Guide. Apple . Cupertino . 2008. PDF version available at no cost online from http://developer.apple.com/mac/library/documentation/?UserExperience/Conceptual/?APStyleGuide/APSG_2008.pdf.
IBM Style, Sixth Edition. IBM . 2004. At various times, a PDF version of this book has been available at no charge online; most recently at http://www-03.ibm.com/easy/page/1387/$File/IBM_Style.pdf — this link is not working as of October 2009.
Microsoft Manual of Style for Technical Publications, Third Edition. Microsoft . Redmond . 2004. Previously, an electronic version of this book was available at no charge online as a Compiled HTML Help (CHM) file from the Microsoft website; this is not presently available in October 2009.
Read Me First! A Style Guide for the Computer Industry. Sun Microsystems . Mountain View . 1996.
Wired Style: Principles of English Usage in the Digital Age. Broadway Books . New York . 1999.