APA (7 वां संस्करण) प्रशस्ति पत्र
Killingsworth, M. J. (2004). Walt Whitman & the earth: A study in ecopoetics. University of Iowa Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Killingsworth, M. Jimmie. Walt Whitman & the Earth: A Study in Ecopoetics. Iowa City: University of Iowa Press, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Killingsworth, M. Jimmie. Walt Whitman & the Earth: A Study in Ecopoetics. University of Iowa Press, 2004.
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