APA (7th ed.) Citation

Lore, P. (2011). I am number four (First paperback edition.). Harper, an imprint of HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Lore, Pittacus. I Am Number Four. First paperback edition. New York: Harper, an imprint of HarperCollins Publishers, 2011.

MLA (8th ed.) Citation

Lore, Pittacus. I Am Number Four. First paperback edition. Harper, an imprint of HarperCollins Publishers, 2011.

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