APA

Modelski G., . (1972). Principles of world politics. New York: The Free Press.

Chicago

Modelski George, . 1972. Principles of world politics. New York: The Free Press.

Harvard

Modelski G., . (1972). Principles of world politics. New York: The Free Press.

MLA

Modelski George, . Principles of world politics. New York: The Free Press. 1972.