APA (7th ed.) Citation

Howell, C. H. (2016). National Geographic pocket guide to the mammals of North America. National Geographic.

Chicago Style (17th ed.) Citation

Howell, Catherine Herbert. National Geographic Pocket Guide to the Mammals of North America. Washington, D. C: National Geographic, 2016.

MLA (9th ed.) Citation

Howell, Catherine Herbert. National Geographic Pocket Guide to the Mammals of North America. National Geographic, 2016.