Williams, R. J. (1964). Free and unequal: The biological basis of individual liberty. Wiley.
芝加哥风格引文Williams, Roger John. Free and Unequal: The Biological Basis of Individual Liberty. New York: Wiley, 1964.
MLA引文Williams, Roger John. Free and Unequal: The Biological Basis of Individual Liberty. Wiley, 1964.
警告：这些引文格式不一定是100％准确.