There's stuff that's tangentially helped me along, but I really think most books on the subject simply amount to mental clutter. My two favourites are 'I Hope They Serve Beer In Hell' by Tucker Max, and 'Nine Ball' by Jeffy from RSD. They're both pretty much just collections of funny weird stories about going out and shagging girls.

As far as actual material on picking up I quite like this video
Natural Instinct Method Manifesto, Guide to Picking Up Girls From Cold Approach - YouTube

But again be careful not to watch too much stuff or consider someone's ideas to be the be all and end all. What works for me or what works for anyone else won't be quite the same as what works for you. You have to approach this as an individual and try to make sense of it all in a way that suits you.

And if you have any general questions I'd recommend just throwing them out to people on here. You'll get good advice from some experienced guys.