Comma Usage

Follow these links for comma rules, reviews, and quizzes:

https://owl.english.purdue.edu/owl/resource/607/01/

http://writingcenter.unc.edu/handouts/commas/

http://www.grammarly.com/handbook/punctuation/comma/

http://www.businessinsider.com/a-guide-to-proper-comma-use-2013-9

http://www.grammarbook.com/grammar_quiz/commas_1.asp