Anybody recommend a good book on program trading?

Quote from rosy:
you don't need a book for fair value program trading. fair value is just a formula.
Quote from wonderworld:
That's what I thought. Then I was wondering why that website about program trading...I won't mention names, but they charge thousands of dollars for a subscription to their program trading website. They give the numbers away for free on their site. Not sure what they are charging for? Actually it's more than thousands of dollars. Something like 2K a month to be a member of their program trading website.