APA (7th ed.) Citation

Knaplund, P. (1941). The British Empire 1815 - 1939: [By] Paul Knaplund. Harper & Brothers.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Knaplund, Paul. The British Empire 1815 - 1939: [By] Paul Knaplund. Harper & Brothers, 1941.