Cita APA

Johnsgard, P. A. (1988). North American Owls: Biology and natural history. Washington, D. C.: Smithsonian Institution.

Citación estilo Chicago

Johnsgard, Paul A. North American Owls: Biology and Natural History. Washington, D. C.: Smithsonian Institution, 1988.

Cita MLA

Johnsgard, Paul A. North American Owls: Biology and Natural History. Washington, D. C.: Smithsonian Institution, 1988.

Precaución: Estas citas no son 100% exactas.