Warner Bros financial information in The William Schaefer Ledger. See Appendix 1, Historical Journal of Film, Radio and Television, (1995) 15:sup1, 1–31, p. 6 doi:10.1080/01439689508604551
Warner Sperling, Cass (Director) (2008). The Brothers Warner (DVD film documentary). Warner Sisters, Inc. Archived from the original on February 17, 2016.
Warner Sperling, Cass (Director) (2008). The Brothers Warner (DVD film documentary). Warner Sisters, Inc. Archived from the original on February 17, 2016.