Gaya APA

Horrendous, H, I, H., Cowel, C. (2009). How to Break a Dragon's Heart . London: Hodder Children's Books.

Gaya MLA

Horrendous, Haddock, III,, Hiccup., Cowel, Cressida. "How to Break a Dragon's Heart". London: Hodder Children's Books, 2009. Text / Book.