APA (7th ed.) Citation

Easton, D. (1971). The political system: An inquiry into the state of political science (2. ed.). Knopf.

Chicago Style (17th ed.) Citation

Easton, David. The Political System: An Inquiry into the State of Political Science. 2. ed. New York: Knopf, 1971.

MLA (9th ed.) Citation

Easton, David. The Political System: An Inquiry into the State of Political Science. 2. ed. Knopf, 1971.