APA (7th ed.) Citation

Riordan, R. (2019). The Heroes Of Olympus #4. Noura Books.

Chicago Style (17th ed.) Citation

Riordan, Rick. The Heroes Of Olympus #4. Noura Books, 2019.

MLA (8th ed.) Citation

Riordan, Rick. The Heroes Of Olympus #4. Noura Books, 2019.

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