Russell, B. (1969). Our Knowledge of the External World: As a Field for Scientific Method in Philosophy. George Allen & Unwin.
Chicago-tyylinen lähdeviittausRussell, Bertrand. Our Knowledge of the External World: As a Field for Scientific Method in Philosophy. London: George Allen & Unwin, 1969.
MLA-viiteRussell, Bertrand. Our Knowledge of the External World: As a Field for Scientific Method in Philosophy. George Allen & Unwin, 1969.
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