Ploeg, F. V. d. (1990). Advanced lectures in qualitative economic. Academic press.
芝加哥风格引文Ploeg, Frederick Van der. Advanced Lectures in Qualitative Economic. London: Academic press, 1990.
MLA引文Ploeg, Frederick Van der. Advanced Lectures in Qualitative Economic. Academic press, 1990.
警告：这些引文格式不一定是100％准确.