APA-referens (7:e uppl.)

Olson, S. F. (1998). Open horizons (1st University of Minnesota ed.). University of Minnesota Press.

Chicago-referens (17:e uppl.)

Olson, Sigurd F. Open Horizons. 1st University of Minnesota ed. Minneapolis: University of Minnesota Press, 1998.

MLA-referens (9:e uppl.)

Olson, Sigurd F. Open Horizons. 1st University of Minnesota ed. University of Minnesota Press, 1998.