APA-referens (7:e uppl.)

Warren, H. C. (1922). Elements of human psychology. Houghton Mifflin company.

Chicago-referens (17:e uppl.)

Warren, Howard C. Elements of Human Psychology. New York [etc.]: Houghton Mifflin company, 1922.

MLA-referens (8:e uppl.)

Warren, Howard C. Elements of Human Psychology. Houghton Mifflin company, 1922.