UW Madison Writer’s Handbook, The Writing Center @ The University of Wisconsin-Madison

http://writing.wisc.edu/Handbook/index.html

For all writers, I strongly recommend a review of all the sections under “Grammar and Punctuation,” but especially: “Subject-Verb Agreement,” “How to Proofread,” “Twelve Common Errors: An Editing Checklist,” and “Clear, Concise Sentences.”

If you are a legal writer, please note that this style manual’s rules on citations are not in sync with The Bluebook, ALWD, or court rules. -CCE