APA-referens (7:e uppl.)

Koopmans, L. H. (1987). Introduction to contemporary statistical methods (2nd ed.). Duxbury Press.

Chicago-referens (17:e uppl.)

Koopmans, Lambert Herman. Introduction to Contemporary Statistical Methods. 2nd ed. Boston: Duxbury Press, 1987.

MLA-referens (9:e uppl.)

Koopmans, Lambert Herman. Introduction to Contemporary Statistical Methods. 2nd ed. Duxbury Press, 1987.