American Ornithologists' Union. 1998.
Check-list of North American birds: 7th edition
The American Ornithologists' Union. Allen Press, Lawrence, Kansas.
(ISBN: 1-891276-00-X)

Clements, James F. 2000.
Birds of the World: A Checklist: Fifth Edition.
Ibis Publishing Company. Vista, California. 867 pgs.
(ISBN: 0-934797-16-1)

Dickinson, Edward C. (Editor). 2003.
The Howard & Moore Complete Checklist of the Birds of the World. Third Edition.
Princeton University Press, Princeton, New Jersey. 1039 pgs.
(ISBN: 0-691-11701-2)

Howard, Richard and Alick Moore. 1991.
A complete checklist of the Birds of the World. Second Edition.
Academic Press. San Diego, California. 622 pgs.
(ISBN 0-12-356910-9)

Johnsgard, Paul A. 1965.
Handbook of Waterfowl Behavior
Comstock Publishing Associates. Cornell University Press. Ithaca, New York. 378 pgs.

Johnsgard, Paul A. 1978.
Ducks, Geese, and Swans of the World
University of Nebraska Press. Lincoln and London. 404 pgs.
(ISBN 8-8032-0953-3)

Madge, Steve and Hilary Burn. 1988.
Waterfowl: an identification guide to the ducks, geese, and swans of the world.
Houghton Mifflin Company. Boston, Massachusetts. 298 pgs.
(ISBN: 0-395-46727-6)

Palmer, Ralph S. 1976.
Handbook of North american birds - Volume 2 - Waterfowl (first part)
Yale University Press. New Haven and London. 521 pgs.
(ISBN 0-300-01902-5)

Sandars, Edmund. 1947.
A Bird Book for the Pocket: Third Edition- Seventh Impression
Oxford University Press. London - New York - Toronto. pgs 122-123.