APA (7th ed.) Citation

Riordan, R. (2009). The last Olympian. Disney Hyperion Books.

Chicago Style (17th ed.) Citation

Riordan, Rick. The Last Olympian. New York: Disney Hyperion Books, 2009.

MLA (9th ed.) Citation

Riordan, Rick. The Last Olympian. Disney Hyperion Books, 2009.