Gemmill, P. F. (1943). Fundamentals of economics (Fourth edition.). Harper.
芝加哥风格引文Gemmill, Paul F. Fundamentals of Economics. Fourth edition. New York: Harper, 1943.
MLA引文Gemmill, Paul F. Fundamentals of Economics. Fourth edition. Harper, 1943.
警告：这些引文格式不一定是100％准确.