APA-referens (7:e uppl.)

Reichheld, F. (2006). The Ultimate Question. HBR Press.

Chicago-referens (17:e uppl.)

Reichheld, Fred. The Ultimate Question. Boston: HBR Press, 2006.

MLA-referens (9:e uppl.)

Reichheld, Fred. The Ultimate Question. HBR Press, 2006.