APA-referens (7:e uppl.)

Johnson, R. (1996). Elementary statistics (7th ed.). Duxbury.

Chicago-referens (17:e uppl.)

Johnson, Robert. Elementary Statistics. 7th ed. Belmont: Duxbury, 1996.

MLA-referens (9:e uppl.)

Johnson, Robert. Elementary Statistics. 7th ed. Duxbury, 1996.