Cowell, C. (2017). How To Train Your Dragon #11: How To Betray A Dragon's Hero (1st.). Hodder's Children's Books.
Citace podle Chicago (17th ed.)Cowell, Cressida. How To Train Your Dragon #11: How To Betray A Dragon's Hero. 1st. Great Britain: Hodder's Children's Books, 2017.
Citace podle MLA (9th ed.)Cowell, Cressida. How To Train Your Dragon #11: How To Betray A Dragon's Hero. 1st. Hodder's Children's Books, 2017.
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