Purdy. This Land Is Our Land. Princeton University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPurdy. This Land Is Our Land. Princeton University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPurdy. This Land Is Our Land. Princeton University Press.
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