APA (7th ed.) Citation

Riordan, R. (2009). The battle of the labyrinth.

Chicago Style (17th ed.) Citation

Riordan, Rick. The Battle of the Labyrinth. 2009.

MLA (8th ed.) Citation

Riordan, Rick. The Battle of the Labyrinth. 2009.

Warning: These citations may not always be 100% accurate.