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Which book(s) can I find the most updated rules for chaos daemons?

Codex: Chaos Demons, with the Curse of the Wulfen campaign supplement.

Alternatively, Codex: Chaos Demons - Chaos Incursion Edition is an eBook available from Black Library that includes both the regular codex and the Chaos Demon stuff from Curse of the Wulfen

Thanks for the response!