Cita APA

Dunn, J. L., & Alderfer, J. (2006). National Geographic field guide to the birds of North America (5. ed.). Washington, D.C.: National Geographic.

Citación estilo Chicago

Dunn, Jon L., y Jonathan Alderfer. National Geographic Field Guide to the Birds of North America. 5. ed. Washington, D.C.: National Geographic, 2006.

Cita MLA

Dunn, Jon L., y Jonathan Alderfer. National Geographic Field Guide to the Birds of North America. 5. ed. Washington, D.C.: National Geographic, 2006.