National Geographic Society (U.S.), Johnson, R. L., & Foster, S. (2010). National Geographic guide to medicinal herbs: The world's most effective healing plants. National Geographic.
Cita Chicago Style (17a ed.)National Geographic Society (U.S.), Rebecca L. Johnson, y Steven Foster. National Geographic Guide to Medicinal Herbs: The World's Most Effective Healing Plants. Washington, D.C.: National Geographic, 2010.
Cita MLA (8a ed.)National Geographic Society (U.S.), et al. National Geographic Guide to Medicinal Herbs: The World's Most Effective Healing Plants. National Geographic, 2010.
Precaución: Estas citas no son 100% exactas.