Stebbing, L. S. (1939). Thinking to some purpose. Penguin Books.
Cita Chicago Style (17a ed.)Stebbing, L. Susan. Thinking to Some Purpose. Harmondsworth: Penguin Books, 1939.
Cita MLA (8a ed.)Stebbing, L. Susan. Thinking to Some Purpose. Penguin Books, 1939.
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