APA (7 वां संस्करण) प्रशस्ति पत्र
Hopkins, B. C. (2011). The origin of the logic of symbolic mathematics: Edmund Husserl and Jacob Klein. Indiana University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Hopkins, Burt C. The Origin of the Logic of Symbolic Mathematics: Edmund Husserl and Jacob Klein. Bloomington: Indiana University Press, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Hopkins, Burt C. The Origin of the Logic of Symbolic Mathematics: Edmund Husserl and Jacob Klein. Indiana University Press, 2011.
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