"The Gouldian Finch" by Gert Ziegler
This informative book published by the Australian Finch Society of Bristol, England was translated from German and is extremely helpful to the Gouldian Breeder.
"Bicheno Finches – Their Care and Breeding" by A. J. Mobbs
One of the "Cage & Aviary Series" of books, it is the only book I know of that is devoted to the Bicheno or Owl Finch. Chapters entitled Bicheno Finches in the Wild, Purchasing stock, Accommodations, Diet, Breeding and Mating Expectations cover everything you need to know about this endearing little finch.
"Finches and other seed-eating birds" by Robin L. Restall
An excellent guide to over 350 seed-eating birds that you might encounter in confinement which includes notes on housing, feeding and breeding.
"Zebra Finches" by Cyril Rogers, 1977, (SB), John Bartholomew & Son, Ltd.
One of the pet-care guides from Bartholomew, this book explains the feeding, housing and breeding of Zebra Finches with lots of information on genetics and the various mutations.
"A Guide to … Gouldian Finches – Their Management, Care and Breeding" by John Summat & Rob Marshall
One of the excellent Australian Birdkeeper Publications, this booklet covers Gouldian requirements, with an excellent section and color photos of all the different types of mutations.
"Finches & Sparrows – An Identification Guide" by Peter Clement, Alan Harris and John Davis
While this book doesn’t have any information on the management of finches in captivity, it will serve as a complete identification guide for finches from anywhere throughout the world.
A Guide to Australian Grassfinches: Their Management, Care & Breeding
A Guide to Gouldian Finches and Their Mutations
A Guide to Asiatic Parrots: Their Mutations, Care & Breeding (Revised Edition)