Here are some articles on goldfish and koi.  Spike's Goldfish Guide, published by the Mid-Atlantic Koi Club, contains information on goldfish varieties, variety descriptions, and pointers on purchasing and showing goldfish.  All proceeds from the sale of the book will go to the Mid-Atlantic Koi Club (MAKC) and the American Goldfish Association (AGA) to help fund efforts for goldfish and koi education and shows.

goldfish articles/order form, Spike's Goldfish Guide.pdf

goldfish articles/Goldfish Varieties A.pdf

goldfish articles/A Guide to Goldfish Resources.pdf

goldfish articles/GFSA Ask the Judges.pdf

goldfish articles/GFSA Ask the Judges, Lionheads.pdf

goldfish articles/GFSA Ask the Judges, Ranchus.pdf

goldfish articles/GFSA Ask the Judges, Ryukins.pdf

goldfish articles/AGA Publication 20.pdf