Cita APA (7a ed.)

Easton, D. (1965). The Political System: An inquiry into the State of Political Science. Knopf.

Cita Chicago Style (17a ed.)

Easton, David. The Political System: An Inquiry into the State of Political Science. New York: Knopf, 1965.

Cita MLA (8a ed.)

Easton, David. The Political System: An Inquiry into the State of Political Science. Knopf, 1965.