Cita APA (7th ed.)

Ryan, W. J. L. (1958). Price theory. Macmillan; St. Martin's Press.

Cita Chicago (17th ed.)

Ryan, William James Louden. Price Theory. London, New York: Macmillan; St. Martin's Press, 1958.

Cita MLA (9th ed.)

Ryan, William James Louden. Price Theory. Macmillan; St. Martin's Press, 1958.