APA (7th ed.) Citation

Riordan, R. (2009). The battle of the labyrinth (1st. ed.). Hyperion Books.

Chicago Style (17th ed.) Citation

Riordan, Rick. The Battle of the Labyrinth. 1st. ed. New York: Hyperion Books, 2009.

MLA (9th ed.) Citation

Riordan, Rick. The Battle of the Labyrinth. 1st. ed. Hyperion Books, 2009.