APA (7th ed.) Citation

Commons, J. R. (1907). Proportional representation (2d ed.). Macmillan.

Chicago Style (17th ed.) Citation

Commons, John R. Proportional Representation. 2d ed. New York: Macmillan, 1907.

MLA (9th ed.) Citation

Commons, John R. Proportional Representation. 2d ed. Macmillan, 1907.