↑Glancy, H Mark (1995). "Warner Bros Film Grosses, 1921–51: the William Schaefer ledger". Historical Journal of Film Radio and Television. 15.
↑Warner Bros financial information in The William Shaefer Ledger. See Appendix 1, Historical Journal of Film, Radio and Television, (1995) 15:sup1, 1–31 p 10 DOI: 10.1080/01439689508604551