APA-viite (7. p.)
Olson, S. F. (1998). Open horizons (1st University of Minnesota ed.). University of Minnesota Press.
Chicago-viite (17. p.)
Olson, Sigurd F. Open Horizons. 1st University of Minnesota ed. Minneapolis: University of Minnesota Press, 1998.
MLA-viite (9. p.)
Olson, Sigurd F. Open Horizons. 1st University of Minnesota ed. University of Minnesota Press, 1998.
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