Petrulionis. Thoreau in His Own Time. University of Iowa Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPetrulionis. Thoreau in His Own Time. University of Iowa Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPetrulionis. Thoreau in His Own Time. University of Iowa Press.
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