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Make More Money at the Poker Tables
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Doyle Brunson's Super System: A Course in Power Poker, 3rd EditionDoyle Brunson's Super System: A Course in Power Poker, 3rd Edition by Doyle Brunson
Buy new: $19.77 / Used from: $8.60
The bible of poker
Doyle Brunson's Super System 2: A Course in Power PokerDoyle Brunson's Super System 2: A Course in Power Poker by Doyle Brunson
Buy new: $25.16 / Used from: $9.93
An update to the bible!
Zen and the Art of Poker: Timeless Secrets to Transform Your GameZen and the Art of Poker: Timeless Secrets to Transform Your Game by Larry Phillips
Buy new: $11.20 / Used from: $2.91
One of the few books that had an immediate positve impact on my game
The Theory of Poker:  A Professional Poker Player Teaches You How To Think Like OneThe Theory of Poker: A Professional Poker Player Teaches You How To Think Like One by David Sklansky
Buy new: $19.77 / Used from: $11.95
Another essential book for the serious poker player
Poker for DummiesPoker for Dummies by Richard D. Harroch
Buy new: $11.55 / Used from: $0.01
A great place to start even if you think you know a thing or two about pokre.
Poker: The Real DealPoker: The Real Deal by Phil Gordon
Buy new: $15.56 / Used from: $0.01
A fun and interesting book that combines strategy with poker history and lore.
Professional Poker: The Essential Guide to Playing for a LivingProfessional Poker: The Essential Guide to Playing for a Living by Mark Blade
Buy new: $16.47 / Used from: $14.95
The title speaks for itself
Winning at Internet Poker For Dummies (For Dummies (Computer/Tech))Winning at Internet Poker For Dummies (For Dummies (Computer/Tech)) by Mark "The Red" Harlan
Buy new: $12.74 / Used from: $2.08
Again a good place to start
Internet Texas Hold'em: Winning Strategies from an Internet ProInternet Texas Hold'em: Winning Strategies from an Internet Pro by Matthew Hilger
Buy used from: $13.59
One of the best books on making decisions based on odds and probability