Cita APA (7th ed.)

Easton, D. (1953). The political system: An inquiry into the state of political science. Alfred A. Knopf.

Cita Chicago (17th ed.)

Easton, David. The Political System: An Inquiry into the State of Political Science. Nueva York: Alfred A. Knopf, 1953.

Cita MLA (9th ed.)

Easton, David. The Political System: An Inquiry into the State of Political Science. Alfred A. Knopf, 1953.