APA (7th ed.) Citation

McGrath, S., & Gibson, B. (1985). Your world of pets. National Geographic Society.

Chicago Style (17th ed.) Citation

McGrath, Susan, and Barbara Gibson. Your World of Pets. Washington, D.C.: National Geographic Society, 1985.

MLA (9th ed.) Citation

McGrath, Susan, and Barbara Gibson. Your World of Pets. National Geographic Society, 1985.