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.
Style de citation Chicago (17e éd.)National Geographic Society (U.S.), Rebecca L. Johnson, et Steven Foster. National Geographic Guide to Medicinal Herbs: The World's Most Effective Healing Plants. Washington, D.C.: National Geographic, 2010.
Style de citation MLA (8e éd.)National Geographic Society (U.S.), et al. National Geographic Guide to Medicinal Herbs: The World's Most Effective Healing Plants. National Geographic, 2010.
Attention : ces citations peuvent ne pas être correctes à 100%.