Willumsen, G., & Nye, B. (2008). 30 años de los especiales de National Geographic. México: National Geographic Society.
Chicago Style CitationWillumsen, Gail, and Barry Nye. 30 Años De Los Especiales De National Geographic. México: National Geographic Society, 2008.
MLA CitationWillumsen, Gail, and Barry Nye. 30 Años De Los Especiales De National Geographic. México: National Geographic Society, 2008.
Warning: These citations may not always be 100% accurate.