Ryan, W. J. L. (1958). Price theory. Macmillan; St. Martin's Press.
芝加哥风格引文Ryan, William James Louden. Price Theory. London, New York: Macmillan; St. Martin's Press, 1958.
MLA引文Ryan, William James Louden. Price Theory. Macmillan; St. Martin's Press, 1958.
警告：这些引文格式不一定是100％准确.