APA (7th ed.) Citation

Knaplund, P. (1941). The British empire, 1815-1939. Harper & Brothers.

Chicago Style (17th ed.) Citation

Knaplund, Paul. The British Empire, 1815-1939. New York ; London: Harper & Brothers, 1941.

MLA (9th ed.) Citation

Knaplund, Paul. The British Empire, 1815-1939. Harper & Brothers, 1941.

Warning: These citations may not always be 100% accurate.