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Winning low limit hold 'em is an excellent book too. A lot of people criticize this book as earlier editions had some mistakes in them but the current (3rd) edition is very, very good. Basically I would say your choices boil down to:

1. Small stakes hold 'em by Ed Miller.

2. Internet Texas hold 'em by Matthew Hilger.

3. Winning low limit hold 'em by Lee Jones.

4. Getting started in hold 'em by Ed Miller.

Assuming your boyfriend is past the beginner stage therefore making him a beginner/ intermediate player, then go with either (or preferably both) of the first two. In my opinion they are the two best books on limit hold 'em available. At least as far as people who play "normal" limits by which I mean 10/20 or below are concerned. Ultra high stakes and middle limit games which I assume your partner doesn't play like 50/100 and higher require different strategies.

Trust me when I say those two books are the best available for the limit player. I own about 60 poker books, most of them on the subject of limit hold 'em and I still consider those two the best.