The Book Influence: the Psychology of Persuasion by Robert Cialini is by far the single best book you can get.
It will NOT give you swipe material to use...but it WILL give you access to the most powerful tools in human nature.
I repeat, this book is the single best book on persuasive writing that exists. In saying that, it was not written for marketers, and has nothing to do with copy.
Even though its not really *that old* it's the CLASSIC text on persuation.
It's scientific.....
Heres a link to amazon for it(not an affiliate link BTW):
http://www.amazon.com/gp/product/068...books&v=glance
definetly check it out if you haven't allready.
Will change how you think about a lot of stuff....
Don't know what more I could say about this book to get you to buy it, just do and then read it 3 times, then another time and take detailed notes.....
-Dave Ryan