APA (7th ed.) Citation

Harsall, W. (1972). Who's who in history. Basil Blackwell.

Chicago Style (17th ed.) Citation

Harsall, W.O. Who's Who in History. Oxford: Basil Blackwell, 1972.

MLA (9th ed.) Citation

Harsall, W.O. Who's Who in History. Basil Blackwell, 1972.