Right now I'm re-reading a book by the famous trial lawyer Gerry Spence.
It's called, "How To Argue And Win Every Time."
And I'm absolutely floored by how much of this book applies to copywriting. Gerry is a true master of persuasion (some of his courtroom "miracles" are more dramatic than the fake ones on TV!). I'd say about 90% of this book can be directly applied to copywriting.
Anyone else have any non-copywriting books that have helped with your copywriting?
Ben