APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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