Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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