Cowell, C. (2010). How to twist a dragon's tale: The heroic misadventures of Hiccup the Viking (First U.S. trade paperback edition.). Little, Brown.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCowell, Cressida. How to Twist a Dragon's Tale: The Heroic Misadventures of Hiccup the Viking. First U.S. trade paperback edition. New York: Little, Brown, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCowell, Cressida. How to Twist a Dragon's Tale: The Heroic Misadventures of Hiccup the Viking. First U.S. trade paperback edition. Little, Brown, 2010.
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