Gier, K. (2020). A castle in the clouds (First edition.). Henry Holt and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGier, Kerstin. A Castle in the Clouds. First edition. New York: Henry Holt and Company, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGier, Kerstin. A Castle in the Clouds. First edition. Henry Holt and Company, 2020.
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