MLA

Bullock, Alan. Hitler : a Study In Tyranny. Abridged ed. New York: Harper & Row, 1971.

APA

Bullock, A. (1971). Hitler : a study in tyranny. Abridged ed. New York: Harper & Row.

Chicago

Bullock, Alan, Hitler: A Study In Tyranny. Abridged ed. New York: Harper & Row, 1971.