APA (7th ed.) Citation

Gray, E. (1972). The killing time: The U-boat war, 1914-1918. Scribner.

Chicago Style (17th ed.) Citation

Gray, Edwyn. The Killing Time: The U-boat War, 1914-1918. New York: Scribner, 1972.

MLA (9th ed.) Citation

Gray, Edwyn. The Killing Time: The U-boat War, 1914-1918. Scribner, 1972.