Cita APA

Johnsgard, P. A. (1990). Hawks, eagles and falcons of North America: Biology and natural history. Washington, D. C.: Smithsonian Institution.

Citación estilo Chicago

Johnsgard, Paul A. Hawks, Eagles and Falcons of North America: Biology and Natural History. Washington, D. C.: Smithsonian Institution, 1990.

Cita MLA

Johnsgard, Paul A. Hawks, Eagles and Falcons of North America: Biology and Natural History. Washington, D. C.: Smithsonian Institution, 1990.