A.B. Zhuk, The Illustrated Encyclopedia Of Handguns: Pistols And Revolvers Of The World, 1870 To The Present (Greenhill Books, 1995). "The present" is not up to date; but this is an amazing, informative book. Zhuk contributed to the designs of some guns, and was (is?) an incredible draftsman. There are no photos in the book, just over 2500 line drawings of fantastic accuracy and detail, and descriptions with a lot of historical background.
Ed Lovette, The Snubby Revolver: The EQC, Backup And Concealed Carry Standard (Paladin Press, 2005). Lovette, now a gun magazine columnist, is a former Special Forces officer, CIA paramilitary operative, and firearms consultant to a number of law enforcement agencies. This is a short book with a lot of good information, illustrative short case histories, and tactical ideas for those who, like me, like and carry these little guns.