APA (7th ed.) Citation

National Geographic Society (U.S.), Paper, D., Paper-Cook, E., Gilmour, D., & Cantwell, P. (1993). Orcas: Lobos de mar. RBA.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.), David Paper, Elisabeth Paper-Cook, Dione Gilmour, and Paul Cantwell. Orcas: Lobos De Mar. [Barcelona]: RBA, 1993.

MLA (9th ed.) Citation

National Geographic Society (U.S.), et al. Orcas: Lobos De Mar. RBA, 1993.