APA Citation

Riordan, R. (2009). Percy Jackson & the Olympians: The demigod files. New York: Disney Hyperion Books.

Chicago Style Citation

Riordan, Rick. Percy Jackson & the Olympians: The Demigod Files. New York: Disney Hyperion Books, 2009.

MLA Citation

Riordan, Rick. Percy Jackson & the Olympians: The Demigod Files. New York: Disney Hyperion Books, 2009.

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