These points are a good summary. I have a fuller explanation here:
csidemedia.com/wellpresentedms
Originally shared by Grammar Girl
15 Ways to Use a Comma http://www.quickanddirtytips.com/education/grammar/how-to-use-commas-a-summary
http://www.quickanddirtytips.com/education/grammar/how-to-use-commas-a-summary
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