ebrary, Inc, & Velkley, R. L. (2007). Freedom and the human person. Catholic University of America Press.
芝加哥风格引文ebrary, Inc, 与 Richard L. Velkley. Freedom and the Human Person. Washington, D.C.: Catholic University of America Press, 2007.
MLA引文ebrary, Inc, 与 Richard L. Velkley. Freedom and the Human Person. Catholic University of America Press, 2007.
警告：这些引文格式不一定是100％准确.