Monster Manual
Unknown
The House of Hades
Rick Riordan
The Heroes of Olympus (4)
Into The Abyss (Demons of Astlan)
Langland, J.
Demons of Astlan (1)
Chinese (Mandarin)
Wikibooks
The Titan's Curse
Percy Jackson and the Olympians (3)
The Sea of Monsters
Percy Jackson and the Olympians (2)
The Lightning Thief
Percy Jackson and the Olympians (1)
The Last Olympian
Percy Jackson and the Olympians (5)
The Demigod Files
Percy Jackson and the Olympians (6)
The Battle of the Labyrinth
Percy Jackson and the Olympians (4)