APA (7th ed.) Citation

World Wildlife Fund. The official World Wildlife Fund guide to endangered species of North America. Beacham.

Chicago Style (17th ed.) Citation

World Wildlife Fund. The Official World Wildlife Fund Guide to Endangered Species of North America. Washington, DC: Beacham.

MLA (9th ed.) Citation

World Wildlife Fund. The Official World Wildlife Fund Guide to Endangered Species of North America. Beacham.

Warning: These citations may not always be 100% accurate.