APA-referens (7:e uppl.)

Marden, O. S. (1913). Training for efficiency. Thomas Y. Crowell company.

Chicago-referens (17:e uppl.)

Marden, Orison Swett. Training for Efficiency. New York: Thomas Y. Crowell company, 1913.

MLA-referens (8:e uppl.)

Marden, Orison Swett. Training for Efficiency. Thomas Y. Crowell company, 1913.