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For tournaments, I like Dan Harrington's two-volume . Harrington on Hold'em

Here is another good book recomended by me
Collin Moshman - Sit 'n Go Strategy - Expert Advice For Beating One-Table Tournaments.
That book will give all what you need in terms of SNG

If someone here have another good book please post here , because I want to learn more about poker
and the best way to do it is playing and reading.
I'll post more books sooon after read them