This article is from the Aquaria: Disease, Algae and Snails FAQ, by Elaine Thompson, Thomas Sasala and George Booth
The Manual of Fish Health
Dr. Chris Andrews, Adrian Exell and Dr. Neville Carrington.
New Jersey: Tetra Press, 1988
This is an outstanding book, and I highly recommend it to anyone who
is interested in reading about fish disease.
Handbook of Fish Diseases
Translation by Howard H. Hirschhorn
T.F.H. Publications, Inc., 1989
This is my second-choice disease book. It is very good, but some of
the treatments may be difficult to obtain, and it goes into more
detail than the average hobbyist needs (or wants) to know.