APA (7th ed.) Citation

Foster, S. ., Johnson, R. L., & Weil, A. (2010). National Geographic guide to medicinal herb: The world's most effective healing plants. National Geographic Society.

Chicago Style (17th ed.) Citation

Foster, Steven , Rebecca L. Johnson, and Andrew Weil. National Geographic Guide to Medicinal Herb: The World's Most Effective Healing Plants. Washington, District of Columbia: National Geographic Society, 2010.

MLA (9th ed.) Citation

Foster, Steven , et al. National Geographic Guide to Medicinal Herb: The World's Most Effective Healing Plants. National Geographic Society, 2010.