Scansion? Stress? Iamb, dactyl, spondee.. purleeze. But that's all over with in 10 pages. This is just the best book ever on verse-forms. And it's not at all dry. The 3rd ed includes a Patterns in Practice supplement which you can flip through when you can't tell your villanelle from your triolet (you pronounce the t, by the way). And I do, I do - these forms have staged a remarkable comeback after the 100-year leveling between Whitman and Ginsberg. The pantoum, famously affected by John Ashbery, is the one that always catches me napping (kind of a cross between villanelle and terza rima, since you ask), while the ghazal (pron guzzle) is the new kid on the block. It's ancient, of course, but there's really just the one book on it in English (Ravishing Disunities)
NB this book is also **tiny!**