APA

Lichtheim George, . (1971). Imperialism. New York: Praeger Publishers.

Chicago

Lichtheim George, . 1971. Imperialism. New York: Praeger Publishers.

Harvard

Lichtheim George, . (1971). Imperialism. New York: Praeger Publishers.

MLA

Lichtheim George, . Imperialism. New York: Praeger Publishers. 1971.