Win at Spades, Advanced Play and Strategy, by Joseph Andrews
Among the topics: advanced bidding strategies, play of hand, partnership conventions, agressive defense, protecting your partner's nil bids, bagging opponents, duplicated Spades techniques, and individual games for three and four players.

The Complete Win at Spades: Basic, Intermediate & Advanced Strategies and Official Rules, by Joseph Andrews
Basics of Spades; intermediate and advanced strategies; bidding, defense, and partnership techniques; glossary of terminology; bidding quiz and guidelines for effective opening leads; Duplicate Spades and a listing of popular Internet sites.

How Not To Lose At Spades
A book about Spades authored by John Galt Strichman. Identifies over 70 common mistakes that players make which cause them to lose games.