Now reading War and castros : new approaches to the northwestern portuguese Iron Age by Francisco Manuel Veleda Reimão Queiroga. You can get probably get it in an english speaking country, it's edited by Oxford - Archaeopress.
EDIT: Oh and La guerra en el mundo ibérico y celtibérico (ss. VI-II a.de C.) by Pierre Moret y Quesada Sanz. This one I don't think you can find in any other language but Spanish...which is alright to me, I can read Spanish too, but probably harder for most people here.
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