How to Break a Dragon's Heart
Cressida Cowell
How to Train Your Dragon (8)
The Battle of the Labyrinth
Rick Riordan
Percy Jackson and the Olympians (4)
How to Cheat a Dragon's Curse
How to Train Your Dragon (4)
Bilbo's Last Song
J.R.R. Tolkien
Percy Jackson's Greek Gods
Rick Riordan & John Rocco