Ross, R. G. (1970). Obligation: A social theory. University of Michigan Press.
芝加哥风格引文Ross, Ralph Gilbert. Obligation: A Social Theory. Ann Arbor: University of Michigan Press, 1970.
MLA引文Ross, Ralph Gilbert. Obligation: A Social Theory. University of Michigan Press, 1970.
警告：这些引文格式不一定是100％准确.