APA

Leff G., . (1971). History and social theory. New York: Doubleday & Co., Inc.

Chicago

Leff Gordon, . 1971. History and social theory. New York: Doubleday & Co., Inc.

Harvard

Leff G., . (1971). History and social theory. New York: Doubleday & Co., Inc.

MLA

Leff Gordon, . History and social theory. New York: Doubleday & Co., Inc. 1971.