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Kidvett's advice is good. Jan Still also put out a book titled, Central Power Pistols which is an overview of all the handguns of WWI, but has a nice section on the Artillery Luger
I have "The Luger Book: The Encyclopedia of the Borchardt and Borchardt-Luger Handguns, 1885-1985" by John Walter.
Looks like descent book, but i didn't read it yet ;-(
Do you read Italian? An Italkian author put out a book in Italian all about the "Artillery" Lugers. Got it at home for the pictures (I don't read Italian). Will post author's name and title tonight if someone doesn't do it before I get home.