APA-referens (7:e uppl.)

Witte, R. S. (1993). Student workbook to accompany statistics (4th.ed.). HBJ.

Chicago-referens (17:e uppl.)

Witte, Robert S. Student Workbook to Accompany Statistics. 4th.ed. Orlando: HBJ, 1993.

MLA-referens (9:e uppl.)

Witte, Robert S. Student Workbook to Accompany Statistics. 4th.ed. HBJ, 1993.