Bogard, P. (2017). The ground beneath us: From the oldest cities to the last wilderness, what dirt tells us about who we are (First edition.). Little, Brown and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBogard, Paul. The Ground Beneath Us: From the Oldest Cities to the Last Wilderness, What Dirt Tells Us About Who We Are. First edition. New York: Little, Brown and Company, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBogard, Paul. The Ground Beneath Us: From the Oldest Cities to the Last Wilderness, What Dirt Tells Us About Who We Are. First edition. Little, Brown and Company, 2017.
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