Não informado. (1956). Minnesota Studies in the Philosophy of Science. Minnesota Center of Philosophy of Science.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Minnesota Studies in the Philosophy of Science. Minneapolis, Minn: Minnesota Center of Philosophy of Science, 1956.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Minnesota Studies in the Philosophy of Science. Minnesota Center of Philosophy of Science, 1956.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.