Knight, F. H. (1921). Risk, uncertainty and profit. Houghton Mifflin.
芝加哥风格引文Knight, Frank H. Risk, Uncertainty and Profit. Boston: Houghton Mifflin, 1921.
MLA引文Knight, Frank H. Risk, Uncertainty and Profit. Houghton Mifflin, 1921.
警告：这些引文格式不一定是100％准确.