Reddit mentions of Harvey's Revised English Grammar (Harvey's Language Course)

As a former English major and ESL teacher, here's my recommendation:

Look for copies of a classic 20th century English grammar that has stood the test of time. You don't have to read the whole book, but keep it on your desk and use it as a reference.

I'm thinking of books like Harvey's grammar: http://www.amazon.com/Harveys-Revised-English-Grammar-Language/dp/0880622903/

Or "The English Grammar of William Cobbett", which is excellent for your purposes: http://books.google.com/books?id=xBxAAAAAYAAJ

You'll definitely want to consult MLA, CMOS, and APA as well.