APA (7th ed.) Citation

Gibson, R. H. (1931). The German submarine War, 1914 - 1918. Constable.

Chicago Style (17th ed.) Citation

Gibson, R. H. The German Submarine War, 1914 - 1918. London: Constable, 1931.

MLA (9th ed.) Citation

Gibson, R. H. The German Submarine War, 1914 - 1918. Constable, 1931.

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