Hale, S. (2012). Princess Academy: Palace of stone (1st U.S. ed.). Bloomsbury Childrens.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHale, Shannon. Princess Academy: Palace of Stone. 1st U.S. ed. New York: Bloomsbury Childrens, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHale, Shannon. Princess Academy: Palace of Stone. 1st U.S. ed. Bloomsbury Childrens, 2012.
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