Percy Jackson and the battle of the labyrinth．[4] Percy Jackson and the battle of the labyrinth Percy Jackson and the Battle of the Labyrinth Percy Jackson and the Olympians．4，the battle of the Labyrinth Percy Jackson and the last Olympian．[5] Percy Jackson and the sea of monsters．[2] Apollo and the battle of the birds. Percy Jackson and the Titan's curse．[3] Percy Jackson and the rod of Hermes