References in Service Industry

Berlitz International, Inc. 120 Years of Excellence: 1878-1998. Princeton: Berlitz International Inc., 1998.

Orgeron, Devin, Marsha Orgeron, and Dan Streible, eds. Learning with the Lights Off: Educational Film in the United States. New York: Oxford University Press, 2012.

Sellmer, Robert. "Berlitz Schools." Life, February 24, 1947.

Slide, Anthony. Before Video: A History of the Non-Theatrical Film. New York: Greenwood Press, 1992.