Cita APA (7th ed.)

Stebbing, L. S. (1939). Thinking to some purpose. Penguin Books.

Cita Chicago (17th ed.)

Stebbing, L. Susan. Thinking to Some Purpose. Harmondsworth: Penguin Books, 1939.

Cita MLA (8th ed.)

Stebbing, L. Susan. Thinking to Some Purpose. Penguin Books, 1939.