Παραπομπή APA

Russell, B. (1969). Our Knowledge of the External World: As a Field for Scientific Method in Philosophy. George Allen & Unwin.

Παραπομπή Chicago Style

Russell, Bertrand. Our Knowledge of the External World: As a Field for Scientific Method in Philosophy. London: George Allen & Unwin, 1969.

Παραπομπή MLA

Russell, Bertrand. Our Knowledge of the External World: As a Field for Scientific Method in Philosophy. George Allen & Unwin, 1969.