Gerald Leinwand, 1927: High Tide of the Twenties (Basic Books, 2002) p. 214; "RACES: Apology to Jews", TIME Magazine, July 18, 1927
Philip E. Meza, Coming Attractions?: Hollywood, High Tech, and the Future of Entertainment (Stanford University Press, 2007) p. 57; "BUSINESS: Cinemalefactors", TIME Magazine, July 18, 1927