APA (7th ed.) Citation

Easton, D. (1966). A systems approach to political life. Purdue University.

Chicago Style (17th ed.) Citation

Easton, David. A Systems Approach to Political Life. Lafayette, Ind.: Purdue University, 1966.

MLA (9th ed.) Citation

Easton, David. A Systems Approach to Political Life. Purdue University, 1966.