APA (7th ed.) Citation

Seymour-Smith, M. (1976). Who's who in twentieth-century literature. Weidenfeld and Nicolson.

Chicago Style (17th ed.) Citation

Seymour-Smith, Martin. Who's Who in Twentieth-century Literature. London: Weidenfeld and Nicolson, 1976.

MLA (8th ed.) Citation

Seymour-Smith, Martin. Who's Who in Twentieth-century Literature. Weidenfeld and Nicolson, 1976.