APA

Davies M. R., Lewis V. A., . (1971). Models of political systems. New York: Praeger Publishers.

Chicago

Davies Morton R, Lewis Vaughan A, . 1971. Models of political systems. New York: Praeger Publishers.

Harvard

Davies M. R., Lewis V. A., . (1971). Models of political systems. New York: Praeger Publishers.

MLA

Davies Morton R, Lewis Vaughan A, . Models of political systems. New York: Praeger Publishers. 1971.