Cita APA (7a ed.)

Allen, T. B., & Grosvenor, G. M. (1974). Vanishing wildlife of North America. National Geographic Society.

Cita Chicago Style (17a ed.)

Allen, Thomas B., y Gilbert M. Grosvenor. Vanishing Wildlife of North America. Washington: National Geographic Society, 1974.

Cita MLA (9a ed.)

Allen, Thomas B., y Gilbert M. Grosvenor. Vanishing Wildlife of North America. National Geographic Society, 1974.