APA (7. basım) Alıntı

National Geographic Society (U.S.) & Waring, R. (2009). Polar bears in trouble. Heinle/ Cengage Learning.

Chicago Style (17. basım) Atıf

National Geographic Society (U.S.) ve Rob Waring. Polar Bears in Trouble. London: Heinle/ Cengage Learning, 2009.

MLA (9th ed.) Atıf

National Geographic Society (U.S.) ve Rob Waring. Polar Bears in Trouble. Heinle/ Cengage Learning, 2009.