APA (7th ed.) Citation

Pittacus. (2012). I am number four: The lost file. Penguin Books.

Chicago Style (17th ed.) Citation

Pittacus. I Am Number Four: The Lost File. Melbourne: Penguin Books, 2012.

MLA (8th ed.) Citation

Pittacus. I Am Number Four: The Lost File. Penguin Books, 2012.

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