Book Recommendations?

[Aleksander the Average]

can anyone point me to a few good books for laymen on the following subjects?
(they're a bit random...)

• political structures and social organization in pre-Roman Gaul
• recorded interactions between Hellenic and La-Tene cultures and peoples, including trade
• conception of Macedonian military reforms of Philip, especially having to do with his experiences as a hostage in Thebes

I've done a few cursory google searches, and a little browsing on amazon, but if anyone has a really good book that is fun and interesting to read, I'd love a recommendation

[Morrowgan]

Have you looked up the EB Bibliography?