Below are some reviews on horse racing publications I consider to be good.
Exotic Betting by Steve Crist
Steve Crist is considered to be a master of exotic bet strategies.
''I have read every serious book on handicapping I can find, and most of them end up gathering dust on the bookshelf after one or two readings - but not this one. This book is about money management and mathematical probabilities of horseracing and for most horse players - that's where their game needs improvement. After all, if you handicap it right, and bet it wrong, the return will still be zero. Buy the book and then follow the advice - especially for Pick 3's, which is terrific. Reviewer ''Daniel P. Markoff''