Help!

Okay. I'm looking for a book (not that I have any more room on my shelves, but bear with me). Specifically, I'm trying to remember the title of the book of poetic forms that was suggested to me last semester in class. It's the really big one that everyone knows/talks about. The only reason I don't have it already is that I didn't have the money for it. But now I get a paycheck soon, and I wanna buy it. So... anyone? Help? Please?