APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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

警告：這些引文格式不一定是100％准確.