APA Style

Riordan, R. (2008). Percy Jackson and the Olympians , the Battle of the Labyrinth vol.4 (4 ed.). New York: Disney, Hyperion Books.

MLA Style

Riordan, Rick. "Percy Jackson and the Olympians , the Battle of the Labyrinth vol.4". 4 ed. New York: Disney, Hyperion Books, 2008. Text.