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Julius Caesar's Gallic Wars is here:
http://classics.mit.edu/Caesar/gallic.html

Something useful from Tacitus? here
http://www.sacred-texts.com/cla/tac/ag01010.htm#ag_01_016


Cassius Dio has a little bit on Britain
http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/home.html

There's bound to be more somewhere. But that's a start I guess. I'd be interested to read this stuff too so will keep looking.

This is a good read: http://www.amazon.co.uk/gp/product/1841194689/

Has lots of references to Roman and pre-Roman texts, and suggests most of them relate back to a single source. I don't have the book with me to check at the moment, but it's the best book on 'The Druids' that I've come across so far - very readable, and stacks of bibliographic references. The same guy has also written a companion volume on the History of the Celts which is good too.

Perhaps you should order this...
http://www.historymatters.appstate.edu/documents/celtsreview_000.pdf
War, Women, and Druids: Eyewitness Reports and Early Accounts of the Ancient Celts. Philip Freeman.