APA (7th ed.) Citation

Lore, P. (2011). I am number four. Penguin Books.

Chicago Style (17th ed.) Citation

Lore, Pittacus. I Am Number Four. London: Penguin Books, 2011.

MLA (9th ed.) Citation

Lore, Pittacus. I Am Number Four. Penguin Books, 2011.

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