Cita APA (7th ed.)

EASTON, D. (1969). A Systems analysis of political life. University of Chicago Pr..

Cita Chicago (17th ed.)

EASTON, David. A Systems Analysis of Political Life. Chicago: University of Chicago Pr., 1969.

Cita MLA (9th ed.)

EASTON, David. A Systems Analysis of Political Life. University of Chicago Pr., 1969.