APA (7th ed.) Citation

Brownell, M. B. (1988). Busy beavers. National Geographic Society.

Chicago Style (17th ed.) Citation

Brownell, M. Barbara. Busy Beavers. [Washington, D.C.]: National Geographic Society, 1988.

MLA (9th ed.) Citation

Brownell, M. Barbara. Busy Beavers. National Geographic Society, 1988.