Sources about celts

[Poka]

Hello EB Team,
I´ve the following problem:

I wrote a text about celtic warfare and used Europa Barbarorum texts as a reference. But I can´t write, that I´ve got the information from Europa Barbarorum (which is, in fact, still a PC game), because it wouldn´t be accepted as a historical source.

Maybe you could help me by telling me some sources (Books for example) about celtice warfare (especially about stuff like Ceannlann-armor, battle axes, greatswords and two handed hammers).

I know that there was already a thread about the two handed swords and hammers. You said that this hammers were found at Ballykane Hill and Newtown, do you have any links or literature about this?

I hope you can help me.



Sorry if my English isn´t perfect