APA (7th ed.) Citation

National Geographic Society (U.S.), Truitt, L., Noxon, N., Hess, J., & Jameson Henry, C. (1997). Ártico extremo. RBA.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.), Lisa Truitt, Nicolas Noxon, Janet Hess, and Christine Jameson Henry. Ártico Extremo. [Barcelona]: RBA, 1997.

MLA (9th ed.) Citation

National Geographic Society (U.S.), et al. Ártico Extremo. RBA, 1997.