Do you want to learn more about Pheasants?

The definitive texts giving full accounts of the group and each species are:

Delacour, J. (1977). The Pheasants of the World. 2nd Edition. Spur Publications, Hindhead , U.K. & World Pheasant Association, Reading, U.K. 395 pp. (ISBN 0 904558 37 1)
Del Hoyo J, Elliott, A & Sargatal J - Handbook of the Birds of the World Vol. 2 New World Vultures to Guineafowl Del Hoyo, J., Elliott, A. & Sargatal, J. (1994). Handbook of the Birds of the World. Volume 2, New World Vultures to Guineafowl. Lynx Edicions, Barcelona, Spain. 638 pp. (ISBN 84 87334 15 6)
Johnsgard PA. - Pheasants of the World Johnsgard, P.A. (1999). The Pheasants of the World: Biology and Natural History. 2nd Edition. Smithsonian Institution Press, Washington D.C., U.S.A. 398 pp. (ISBN 1 56098 839 8)
Madge S & McGowan P - Pheasants, Partridges and Grouse Madge, S. & McGowan, P. (2002). Pheasants, Partridges and Grouse: a guide to the pheasants, partridges, quails, grouse, guineafowl, buttonquails and sandgrouse of the world. Helm Identification Guides. Christopher Helm, London, U.K. 488 pp. (ISBN 0 7136 3966 0)
Hennache, A. & Ottaviani, M. (2005) Monographie des faisans, Volume 1. WPA France, Clères, France.
(ISBN 2 9512467 1 4.)

The World Pheasant Association and the Game & Wildlife Conservation Trust offer a number of other relevant books for sale (WPA books are sold through Game Conservancy Limited's Sales Centre).

There are a large number of websites dedicated wholly or in part to pheasants: the PSG particularly recommends the following:

World Pheasant Association
Game & Wildlife Conservation Trust
Oriental Bird Club
GBWF.net
American Pheasant and Waterfowl Society