Παραπομπή σε μορφή APA (7η εκδ.)

Cowell, C. (2008). How to twist a dragon's tale: The heroic misadventures of Hiccup the Viking (First U.S. edition.). Little Brown and Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Cowell, Cressida. How to Twist a Dragon's Tale: The Heroic Misadventures of Hiccup the Viking. First U.S. edition. New York: Little Brown and Company, 2008.

Παραπομπή σε μορφή MLA (9th εκδ.)

Cowell, Cressida. How to Twist a Dragon's Tale: The Heroic Misadventures of Hiccup the Viking. First U.S. edition. Little Brown and Company, 2008.