^ abWarner Bros financial information in The William Shaefer Ledger. See Appendix 1, Historical Journal of Film, Radio and Television, (1995) 15:sup1, 1-31 p 25 DOI: 10.1080/01439689508604551
Daftar pustaka
Dolan, Edward F. Jr. Hollywood Goes to War. London: Bison Books, 1985. ISBN0-86124-229-7.
Hardwick, Jack and Ed Schnepf, . "A Viewer's Guide to Aviation Movies". The Making of the Great Aviation Films, General Aviation Series, Volume 2, 1989.
Orriss, Bruce. When Hollywood Ruled the Skies: The Aviation Film Classics of World War II. Hawthorne, California: Aero Associates Inc., 1984. ISBN0-9613088-0-X.