Cowell, C. (2013). How to betray a dragon's hero: The heroic misadventures of Hiccup the viking (First U.S. edition.). Little, Brown and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCowell, Cressida. How to Betray a Dragon's Hero: The Heroic Misadventures of Hiccup the Viking. First U.S. edition. New York ; Boston: Little, Brown and Company, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCowell, Cressida. How to Betray a Dragon's Hero: The Heroic Misadventures of Hiccup the Viking. First U.S. edition. Little, Brown and Company, 2013.
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