APA (7th ed.) Citation

Hassall, W. O. (1960). Who's who in history. Basil Blackwell.

Chicago Style (17th ed.) Citation

Hassall, William Owen. Who's Who in History. Oxford: Basil Blackwell, 1960.

MLA (9th ed.) Citation

Hassall, William Owen. Who's Who in History. Basil Blackwell, 1960.