APA (7th ed.) Citation

Riordan, R. (2010). Percy Jackson: The Demigold files. Puffin Books.

Chicago Style (17th ed.) Citation

Riordan, Rick. Percy Jackson: The Demigold Files. London: Puffin Books, 2010.

MLA (9th ed.) Citation

Riordan, Rick. Percy Jackson: The Demigold Files. Puffin Books, 2010.

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