Writing Resources

GrammarBook.com - Jane Straus

Free usage rules for grammar & punctuation & homonyms, etc.
http://www.grammarbook.com/

Free interactive quizzes
http://www.grammarbook.com/english_rules.asp

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http://www.grammarbook.com/register.asp

Manual of Style - Wikipedia
https://en.wikipedia.org/wiki/Wikipedia%3aManual_of_Style