APA-referens (7:e uppl.)

Howell, D. C. (2010). Statistical methods for psychology (7th ed.). Wadsworth/Cengage Learning.

Chicago-referens (17:e uppl.)

Howell, David C. Statistical Methods for Psychology. 7th ed. Belmont, Calif: Wadsworth/Cengage Learning, 2010.

MLA-referens (9:e uppl.)

Howell, David C. Statistical Methods for Psychology. 7th ed. Wadsworth/Cengage Learning, 2010.