National Geographic Society (Washington, D.C.). (1978). Energy [videorecording]: The problems and the future. The Society.
Chicago-referens (17:e uppl.)National Geographic Society (Washington, D.C.). Energy [videorecording]: The Problems and the Future. Washington, D.C: The Society, 1978.
MLA-referens (9:e uppl.)National Geographic Society (Washington, D.C.). Energy [videorecording]: The Problems and the Future. The Society, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.