National Geographic Society. (1988). The explorers, a century of discovery [Vídeo] (Special commemorative ed.). National Geographic.
Cita Chicago Style (17a ed.)National Geographic Society. The Explorers, a Century of Discovery [Vídeo]. Special commemorative ed. United Kingdom: National Geographic, 1988.
Cita MLA (9a ed.)National Geographic Society. The Explorers, a Century of Discovery [Vídeo]. Special commemorative ed. National Geographic, 1988.
Precaución: Estas citas no son 100% exactas.