Ali, Sálim. 1996.
The Book of Indian Birds
Bombay Natural History Society. Oxford University Press. Mumbai, Delhi, Calcuta, Madras. 354 pgs.
(ISBN 0 19 563731 3)

American Ornithologists' Union. 1998.
Check-list of North American birds: 7th edition
The American Ornithologists' Union. Allen Press, Lawrence, Kansas. 829 pgs.
(ISBN: 1-891276-00-X)

Araya M., Braulio and Guillermo Millie H. 1998.
Guía de campo de las aves de Chile
Editorial Universitaria, S. A. Santiago de Chile. pgs 114-115.
(ISBN 956-11-1236-1) (Spanish)

Azpiroz, Adrián B. 1997.
Aves del Uruguay: Lista, estatus y distribución
Probides. Rocha, Uruguay. 52 pgs.
(ISBN: 9974-7532-2-8) (Spanish)

Barattini, Luis P. and Rodolfo Escalante. 1971.
Catálogo de las aves uruguayas: 2ª parte -Anseriformes
Intendencia Municipal de Montevideo. Montevideo. pgs 35-37. (Spanish)

Beaman, Mark and Steve Madge. 1998.
The Handbook of Bird Identification for Europe and the Western Palearctic
Princeton University Press. Princeton, New Jersey. 868 pgs.
(ISBN 0-691-02726-9, LC: QL690.A1B385 1998)

Bellrose, Frank C. 1976.
Ducks, Geese & Swans of North America: Second Edition
Stackpole Books. Harrisburg, Pennsylvania. 543 pgs.
(ISBN: 0-8117-0535-8)

Bond, James. 1993.
Birds of the West Indies: Quinta Edición
Houghton Mifflin company. Boston, New York. 256 pgs.

Clancey, P. A. 1964.
The Birds of Natal and Zululand
Oliver & Boyd. Edinburgh and London. 511 pgs.

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

Cramp, Stanley, et all. 1977.
Handbook of the birds of Europe, the Middle East, and North Africa: the birds of the Western Palearctic. Volume 1: Ostrich - Ducks
Oxford University Press. Oxford, London and New York. 722 pgs.
(ISBN: 0-19-857358-8)

Goodall, J. D., A. W. Johnson and Dr. R. A. Philippi B. 1951.
Las Aves de Chile: su conocimiento y sus costumbres: Tomo Segundo
Platt Establecimuentos Gráficos S. A. Pg 132. (Spanish)

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)

Howell, Steve N. G. and Sophie Webb. 1995.
A guide to the birds of Mexico and Northern Central America
Oxford University Press. Oxford, New York, Tokyo. 851 pgs.
(ISBN: 0 19 854013 2 and 0 19 854012 4)

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)

Langrand, Oliver. 1990.
Birds of Madagascar
Yale University Press. New Haven & London. 364 pgs.
(ISBN: 0-300-04310-4)

Madge, Steve, and Hilary Burn. 1988.
Waterfowl: an identification guide to the ducks, geese, and swans of the world
Houghton Mifflin Company. Boston, Massachusetts. pgs 28-29, 126-127.
(ISBN 0-395-46727-6 and 0-395-46726-8)

Narosky, T. and D. Yzurieta. 1989.
Guía para la identificación de las aves de Argentina y Uruguay
Vazquez Mazzini Editores. Buenos Aires, Argentina. 345 pgs.
(ISBN: 950-99063-0-1) (Spanish)

Orlog, Claës Chr. 1968.
Las aves sudamericanas: una guía de campo: Tomo primero (Pingüinos-Pájaros Carpinteros)
Universidad Nacional de Tucumán. Argentina. Pg 99. (Spanish)

Palmer, Ralph S. 1976.
Handbook of North American Birds: Waterfowl
Yale University Press. New Haven and London. Vol 2. 521 pgs.
(ISBN 0-300-01902-5)

Peterson, Roger Tory and Edward L. Chalif. 1998.
Aves de México: Guía de Campo: Identificación de todas las especies encontradas en México, Guatemala, Belice y El Salvador
Editorial Diana. México, D.F., México. 3a Impresión. 473 pgs
(ISBN: 968-13-1282-1) (Spanish)

Pratt, H. Douglas, Phillip L. Bruner and Delwyn G. Berrett. 1987.
The birds of Hawaii and the Tropical Pacific
Princeton University Press. Princeton, New Jersey. 409 pgs.
(ISBN: 0-691-08402-5 and 0-691-02399-9)

Raffaele, Herbert, James Wiley, Orlando Garrido, Allan Keith, and Janis Raffaele. 1998.
A Guide to the Birds of the West Indies
Princeton University Press. Princeton, New Jersey. 511 pgs.

Ridgely, Robert S. and Paul J. Greenfield. 2001.
The Birds of Ecuador. Volume II. Field Guide
Cornell University Press. Ithaca, New York. 740 pgs.
(ISBN: 0-8014-8721-8)

Sinclair, Ian, Phil Hockey and Warwick Tarboton. 1993.
Ilustrated Guide to the Birds of Southern Africa
Princeton University Press. Princeton, New Jersey. 426 pgs.
(ISBN: 0 691 04469)

Soothill, Eric and Peter Whitehead. 1978.
Wildfowl of the World
Blandford Press. Poole, Dorset. 297 pgs.
(ISBN: 0 7137 0863 8)

Stiles, F. Garay and Alexander F. Skutch. 1989.
A Guide to the birds of Costa Rica
Comstock Publishing Associates, a Division of Cornell University Press. Ithaca, New York. Página 91.
(ISBN 0-8014-2287-6 and 0-8014-9600-4)

Stockton de Dod, Annabelle. 1981.
Guía de Campo para las Aves de la República Dominicana
Editora Horizontes de América, Santo Domingo, República Dominicana. Pg 43. (Spanish)

Stotz, Douglas F., John W. Fitzpatrick, Theodore A. Parker III and Debra K. Moskovits. 1996.
Neotropical Birds: Ecology and Conservation
The University of Chicago Press. Chicago and London. 478 pgs.
(ISBN: 0-226-77629-8 and 0-226-77630-1, LC: QL685.7.N46 1996)

Wetmore, Alexander. 1926.
Observations on the birds of Argentina, Paraguay, Uruguay, and Chile
Smithsonian Institution. Bulletin 133. Washington. Pg 73.