J. M. Thiollay. Family Accipitridae (Hawks and Eagles) in del Hoyo, J., Elliott, A., & Sargatal, J., eds. Vol. 2 New World Vultures to Guineafowl. // Handbook of the birds of the world — Barcelona: Lynx Edicions, 1994. — ISBN 84-87334-15-6. (инг.)