Single best reference book?

[Luke]

There is no single book which will provide a comprehensive, in-depth view of Lugers. Jim's suggestion of the Kenyon book, "Lugers at Random," is a good place to start and provides a good overview.

Once you have fully explored Kenyon's book, the Jan Still set will provide excellent, in-depth information on the different Luger categories. My personal favorite is Still's "Imperial Lugers," but I only arrived at that point after researching all types and settling on one area, Imperial Lugers.

Best of luck, and good hunting.

Luke