Keyhoe, D. E. (1954). Flying saucers from outer space: By Donald E. Keyhoe (1st print.). Permabooks.
Chicago-referens (17:e uppl.)Keyhoe, Donald E. Flying Saucers from Outer Space: By Donald E. Keyhoe. 1st print. Garden City, NY: Permabooks, 1954.
MLA-referens (8:e uppl.)Keyhoe, Donald E. Flying Saucers from Outer Space: By Donald E. Keyhoe. 1st print. Permabooks, 1954.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.