Theory of Blackjack, by Peter A. Griffin
This classic work on the mathematics of blackjack provides insight into the methods and numbers behind the development of today's card-counting systems.

Professional Blackjack, by Stanford Wong
Card-counting advice for beginners to experts. It presents the high-low, which is the best combination of simplicity and power, and the halves, which is a level-3 system that yields excellent estimates and information to determine the optimal bet size.

You Can Win!: Blackjack Made Easy, by Stephen Mead
From basic to advanced strategy to money management and casino etiquette, the book provides many examples, charts, and practice exercises to illustrate each lesson and take the guesswork out of gambling.