APA (7 वां संस्करण) प्रशस्ति पत्र
Stewart, J. (2008). Heiberg's Contingency regarded from the point of view of logic and other texts. Museum Tusculanum Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Stewart, Jon. Heiberg's Contingency Regarded from the Point of View of Logic and Other Texts. Copenhagen, Denmark: Museum Tusculanum Press, 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Stewart, Jon. Heiberg's Contingency Regarded from the Point of View of Logic and Other Texts. Museum Tusculanum Press, 2008.
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