Waldman, A. (2019). A door in the earth (First edition.). Little, Brown and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWaldman, Amy. A Door in the Earth. First edition. New York: Little, Brown and Company, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWaldman, Amy. A Door in the Earth. First edition. Little, Brown and Company, 2019.
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