APA (7 वां संस्करण) प्रशस्ति पत्र
Von der Heydt, J. E. (2008). At the brink of infinity: Poetic humility in boundless American space. University of Iowa Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Von der Heydt, James E. At the Brink of Infinity: Poetic Humility in Boundless American Space. Iowa City: University of Iowa Press, 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Von der Heydt, James E. At the Brink of Infinity: Poetic Humility in Boundless American Space. University of Iowa Press, 2008.
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