Cita APA (7a ed.)

Foster, S., & Johnson, R. L. (2008). National Geographic desk reference to nature's medicine. National Geographic ; Publishers Group UK [distributor].

Cita Chicago Style (17a ed.)

Foster, Steven, y Rebecca L. Johnson. National Geographic Desk Reference to Nature's Medicine. Washington, D.C. : Enfield: National Geographic ; Publishers Group UK [distributor], 2008.

Cita MLA (8a ed.)

Foster, Steven, y Rebecca L. Johnson. National Geographic Desk Reference to Nature's Medicine. National Geographic ; Publishers Group UK [distributor], 2008.

Precaución: Estas citas no son 100% exactas.