Ploeg, F. v. d. (1990). Advanced lectures in qualitative economics. Academic Press.
芝加哥风格引文Ploeg, Frederick van der. Advanced Lectures in Qualitative Economics. London: Academic Press, 1990.
MLA引文Ploeg, Frederick van der. Advanced Lectures in Qualitative Economics. Academic Press, 1990.
警告：这些引文格式不一定是100％准确.