APA (7th ed.) Citation

Riordan, R. (2016). The trials of Apollo: The hidden oracle. Puffin Books.

Chicago Style (17th ed.) Citation

Riordan, Rick. The Trials of Apollo: The Hidden Oracle. London: Puffin Books, 2016.

MLA (9th ed.) Citation

Riordan, Rick. The Trials of Apollo: The Hidden Oracle. Puffin Books, 2016.

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