ebrary, Inc, & Clotfelter, C. T. (1991). Economic challenges in higher education. University of Chicago Press.
芝加哥风格引文ebrary, Inc, 与 Charles T. Clotfelter. Economic Challenges in Higher Education. Chicago: University of Chicago Press, 1991.
MLA引文ebrary, Inc, 与 Charles T. Clotfelter. Economic Challenges in Higher Education. University of Chicago Press, 1991.
警告：这些引文格式不一定是100％准确.