book on inequalities to help prepare for the Putnam exam

ehrenfest

I want to get a book on inequalities to help prepare for the Putnam exam. Its common for me to spend about half an hour getting frustrated on a practice problem and then find that the only way to do the problem is with an inequality that I have never heard of. Does anyone have any recomendations? Here are some I found on amazon:

http://www.amazon.com/Introduction-I...0962368&sr=1-2
http://www.amazon.com/Cauchy-Schwarz...0962111&sr=8-2
http://www.amazon.com/Inequalities-C...0962431&sr=1-1