APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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