APA (7th ed.) Citation

Sears, S. W. (1973). The horizon history of the british empire. American Heritage Pub. Co..

Chicago Style (17th ed.) Citation

Sears, Stephen W. The Horizon History of the British Empire. New York: American Heritage Pub. Co., 1973.

MLA (9th ed.) Citation

Sears, Stephen W. The Horizon History of the British Empire. American Heritage Pub. Co., 1973.