American Ornithologists' Union. 1998.
Check-list of North American Birds: 7th edition
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. Santiago de Chile. Pgs 146-153. (ISBN: 956-11-1236-1) (Spanish)

Barlow, Clive and Tim Wacher. 1997.
A field guide to birds of the Gambia and Senegal
Yale University Press. New Haven and London. 400 pgs.
(ISBN: 0-300-07454-9)

Beehler, Bruce M., Thane K. Pratt, and Dale A. Zimmerman. 1986.
Birds of New Guinea
Princeton University Press. Princeton, New Jersey. 296 pgs.
(ISBN 0-691-02394-8 and 0-691-08385-1)

Brown, Leslie H, Emil K. Urban and Kenneth Newman. 1982.
The Birds of Africa. Volume I.
Academic Press. London - New York. 521 pgs.
(ISBN: 0-12-137301-0)

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

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)

Cuello, Juan. 1994.
Aves Uruguayas (Síntesis de las Familias) 1ª Parte: No Passeriformes.
Intendencia Municipal de Montevideo. Museo Damaso Antonio Larrañaga. Montevideo, Uruguay. Pgs 67-68. (Spanish)

González, Godofredo, et all. 1983.
Fauna y Flora de Europa: Guía de campo básica
Editorial Blume. Barcelona, España. 399 pgs.
(ISBN: 84-7031-505-6) (Spanish)

Gyldenstolpe, Nils. 1945.
A Contribution to the Ornithology of Northern Bolivia.
Almqvist & Wiksells Boktryckeri AB. Stockholm. 301 pgs.

Hancock, James, and James Kushlan. 1984.
The herons handbook
Harper & Row, Publishers, Inc. New York, New York. 288 pgs.
(ISBN 0-06-015331-8)

Henry, G. M. 1971.
A Guide to the Birds of Ceylon
Oxford University Press. London, New York, Bombay.

Hilty, Steven L. and William L. Brown. 1986.
A guide to the Birds of Colombia
Princeton University Press. Princeton. New Jersey. 836 pgs.
(ISBN: 0-691-08371-1 and 0-691-08372-X)

Land, Hugh C. 1970.
Birds of Guatemala
Livingston Publishing Company. Wynnewood, Pennsylvania. 381 pgs.
(ISBN: 0-87098-030-0)

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

Mackinnon,John and Karen Phillipps. 1997.
The Birds of Borneo, Sumatra, Java, and Bali
Oxford University Press. Oxford, Nueva York, Tokio. 491 pgs.
(ISBN: 0 19 854035 3 and 0 19 854034 5)

Mikuska, Tibor, James A. Kushlan, and Steve Hartley. 1998.
Key Areas for Wintering North American Herons
Colonial Waterbirds. Vol 21. No 2. Pgs 125-134.

Ogilvie-Grant, W. R. 1898.
Catalogue of the PLATALEÆ, HERODIONES, STEGANOPODES, PYGOPODES, ALCÆ, and IMPENNES in the collection of the British Museum
British Museum (Natural History). London. Vol 26. 687 pgs más 14 láminas.

Olrog, Claës Chr. 1968.
Las Aves Sudamericanas: Una guía de campo
Tomo Primero ( Pingüinos - Pájaros Carpinteros )
Universidad Nacional de Tucumán. Fundación - Instituto “Miguel Lillo”. Argentina. 505 pgs. (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 más 45 láminas.
(ISBN: 0-691-08402-5 and 0-691-02399-9)

Rand, Austin L. and E. Thomas Gilliard. 1968.
Handbook of New Guinea Birds
The Natural History Press. Garden City, New York. 628 pgs.

Rodríguez, José Vicente. 1982.
Aves del Parque Nacional Natural los Katíos: Antioquia, Chocó, Colombia
Proyecto ICA. Talleres Inderena. Bogota. 328 pgs. (Spanish)

Shirihai, Hadoram. 1996.
The Birds of Israel
Academic Press Limited. London. 692 pgs.
(ISBN 0-12-640255-8)

Sick, Helmut. 1993.
Birds in Brazil
Traducido al inglés del portugués por William Belton
Princeton University Press. Princeton, New Jersey.
(ISBN: 0-691-08569-2)

Smythies, Bertram E. 1968.
The birds of Borneo
Oliver & Boyd. Edinburgh and London. 593 pgs.

Stiles, Gary F. and Alexander F. Skutch. 1989.
A Guide to the Birds of Costa Rica
Comstock Publishing Associates. Ithaca, New York. 511 pgs.
(ISBN: 0-8014-2287-6 and 0-8014-9600-4)

Wetmore, Alexander. 1926.
Observations on the birds of Argentina, Paraguay, Uruguay, and Chile
Smithsonian Institution. Bulletin 133. Washington. Pgs 91-92.