Cita APA (7th ed.)

RYAN, W. (1966). Price theory. Macmillan.

Cita Chicago (17th ed.)

RYAN, W.J.L. Price Theory. New York: Macmillan, 1966.

Cita MLA (9th ed.)

RYAN, W.J.L. Price Theory. Macmillan, 1966.