APA (7th ed.) Citation

Tucker, S. (2001). Who's who in twentieth-century warfare. Routledge.

Chicago Style (17th ed.) Citation

Tucker, Spencer. Who's Who in Twentieth-century Warfare. London: Routledge, 2001.

MLA (9th ed.) Citation

Tucker, Spencer. Who's Who in Twentieth-century Warfare. Routledge, 2001.