ebrary, Inc. (1996). The path to the Ph.D: Measuring graduate attrition in the sciences and humanities. National Academy Press.
芝加哥风格引文ebrary, Inc. The Path to the Ph.D: Measuring Graduate Attrition in the Sciences and Humanities. Washington, D.C.: National Academy Press, 1996.
MLA引文ebrary, Inc. The Path to the Ph.D: Measuring Graduate Attrition in the Sciences and Humanities. National Academy Press, 1996.
警告：这些引文格式不一定是100％准确.