Cita APA (7a ed.)

Wheeler, E. (1942). Tested direct selling. Prentice-Hall.

Cita Chicago Style (17a ed.)

Wheeler, Elmer. Tested Direct Selling. New York: Prentice-Hall, 1942.

Cita MLA (9a ed.)

Wheeler, Elmer. Tested Direct Selling. Prentice-Hall, 1942.