Cita APA (7a ed.)

Buchanan, W. (1988). Understanding political variables (4th ed.). Macmillan.

Cita Chicago Style (17a ed.)

Buchanan, William. Understanding Political Variables. 4th ed. New York: Macmillan, 1988.

Cita MLA (9a ed.)

Buchanan, William. Understanding Political Variables. 4th ed. Macmillan, 1988.