I almost hate to recommend the book, but our standard text was "Pressman's 5th" and that does have a reasonably comprehensive survey of methodologies. You'd be better off borrowing it than buying it.

It's not hard to see that agile models are pretty closely related to Boehm's spiral model. The spiral model is (afaik) more general, with the agile models focusing more on specific processes/practices.

http://www.amazon.com/Software-Engineering-Practitioners-Rog...