Olson, S. F. (1998). Open horizons (1st University of Minnesota ed.). University of Minnesota Press.
芝加哥风格引文Olson, Sigurd F. Open Horizons. 1st University of Minnesota ed. Minneapolis: University of Minnesota Press, 1998.
MLA引文Olson, Sigurd F. Open Horizons. 1st University of Minnesota ed. University of Minnesota Press, 1998.
警告：这些引文格式不一定是100％准确.