Cita APA (7a ed.)

National Geographic Television, Willumsen, G., & Kiley, R. (2009). 30 years of National Geographic specials. National Geographic.

Cita Chicago Style (17a ed.)

National Geographic Television, Gail Willumsen, y Richard Kiley. 30 Years of National Geographic Specials. [Washington, D.C.]: National Geographic, 2009.

Cita MLA (8a ed.)

National Geographic Television, et al. 30 Years of National Geographic Specials. National Geographic, 2009.

Precaución: Estas citas no son 100% exactas.