APA-referens (7:e uppl.)

Frederick, J. G. (1929). Selling by telephone. Business Bourse Publishers.

Chicago-referens (17:e uppl.)

Frederick, J. George. Selling by Telephone. New York: Business Bourse Publishers, 1929.

MLA-referens (8:e uppl.)

Frederick, J. George. Selling by Telephone. Business Bourse Publishers, 1929.