APA (7th ed.) Citation

Halpern, P. G. (1994). A naval history of World War I. UCL Press.

Chicago Style (17th ed.) Citation

Halpern, Paul G. A Naval History of World War I. London: UCL Press, 1994.

MLA (9th ed.) Citation

Halpern, Paul G. A Naval History of World War I. UCL Press, 1994.