National Geographic Society, Washington, D.C, WQED (Television station : Pittsburg, Pa.), Kane, D. B., Noxon, N., & Skinner, T. (1988). The explorers [videorecording]: A century of discovery. The Society.
Lua i Stíl Chicago (17ú heag.)National Geographic Society, Washington, D.C, Pa.) WQED (Television station : Pittsburg, Dennis B. Kane, Nicolas Noxon, agus Thomas Skinner. The Explorers [videorecording]: A Century of Discovery. [Washington, D.C.]: The Society, 1988.
Lua MLA (9ú heag.)National Geographic Society, Washington, D.C, et al. The Explorers [videorecording]: A Century of Discovery. The Society, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.