Visit this YourDictionary.com page for a useful article about punctuation marks. http://grammar.yourdictionary.com/punctuation/punctuation-rules-help.html

Visit this site for a useful list of irregular verbs in English. http://www.englishpage.com/irregularverbs/irregularverbs.html

This site from Capital Community College in Connecticut provides a menu of English grammar resources. http://grammar.ccc.commnet.edu/grammar

EnglishClub.com is dedicated to English learners and those for whom English is a second language—but it can be useful for all of us. http://www.englishclub.com/grammar

The original (1918) edition of the famous style guide The Elements of Style is available online at Bartleby.com. http://www.bartleby.com/141

The Writers and Editors site presents an article on tact and tone in editing the work of others. http://www.writersandeditors.com/tips_on_tact_and_tone_30805.htm

Merriam-Webster provides a chart of proofreader’s marks and their meanings. http://www.merriam-webster.com/mw/table/proofrea.htm

Visit this About.com site for information on designing a document. http://desktoppub.about.com/od/designprinciples/Principles_of_Design.htm

For in-depth information on how to present visuals effectively, visit the Web site of Edward Tufte, a Professor Emeritus at Yale University, where he taught courses in statistical evidence, information design, and interface design. http://www.edwardtufte.com/tufte/index

For a wealth of articles and information about typefaces and other aspects of document design, explore the Web site of AIGA, the professional association for design. http://www.aiga.org/content.cfm/about