Blackjack Counting Strategy

I want to know what is the best book on blackjack and basic counting strategy, it is allowed if more than one, it suffices to explain the main use of each review the way thanks for your time =).

There are plenty of books out there, and most of them are almost the same.

You can get much information on counting systems free on the Internet, here is an example, one from a free site for basic strategy and card counting:

http://www.thedoverpro.com/blackjack.htm

Good luck!