Benko, K. (2020). Secret in the stone (Paperback edition.). Bloomsbury Children's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBenko, Kamilla. Secret in the Stone. Paperback edition. New York: Bloomsbury Children's Books, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBenko, Kamilla. Secret in the Stone. Paperback edition. Bloomsbury Children's Books, 2020.
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