hmm... so many books. How long you going for?
Some of my faves,
E-Tales by Matt Beumont - Not exactly a marketing or ad book, but a funny way of getting an insight into how the industry works
Andrew Griffiths, very good - Ways to market your business
Common Sense Direct Marketing - Drayton Bird
Viral Marketing - Russell Goldsmith - dated now but the principles still work
For the PR side, rather than read a formal text book, read something like Piers Morgans - The Insider, very good depiction of the journo world.
One book I had recommended to me was "Selling the Invisible" by Harry Beckwith. I am currently reading this and whilst the example he uses are good, so far it is all the usual stuff of applying a bit of common sense rather than giving a deep insight. saying that I am only half way through it and cannot give a detailed summary.
Happy reading