There is undoubtedly only one "Catfish Bible" in print. This is Dr. Burgess' "Atlas of Freshwater and Marine Catfishes" (TFH: 1989). Lots of photos and good information are included in the book. Like any book, it suffers from a couple problems. The photos are the same old TFH photos that have been around for a long time. The other problem is the age of the book. Entire families have been erected, not to mention numerous genera, since the book's publication. So, taxonomically (I think I just invented a word) speaking, the book is quite out of date. It also suffers from the same misidentifications as all hobby books. Although it is better than most in this respect. Dr. Burgess and Lee Finley published an update to the "Bible" in the October of 1996 issue of TFH magazine.
The "New Testament" would have to be David Sands' "Catfishes of the World". The series consists of five seperate volumnes and numerous supplements. On the negative side, the books are hard to find in the US (would be easiest in the UK), are expensive (expect to pay around US $200+ for all the books), and are getting rather out of date. The last volumne was published in 1985.
The following would fill out a good catfish library:
I would not get too caught up in hobby oriented books. You will soon find that they are often inaccurate and are lacking in information on new species. Your best bet is always a loaded copy card, a Xerox machine, and a day at the University's biology library.