Não informado. (1935). Drama of the skies. American Museum of Natural History, Hayden Planetarium.
Chicago-referens (17:e uppl.)Não informado. Drama of the Skies. New York: American Museum of Natural History, Hayden Planetarium, 1935.
MLA-referens (8:e uppl.)Não informado. Drama of the Skies. American Museum of Natural History, Hayden Planetarium, 1935.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.