APA (7th ed.) Citation

Barnett, M., John, J., & Cornell, K. (2016). The Terrible Two get worse. Amulet Books.

Chicago Style (17th ed.) Citation

Barnett, Mac, Jory John, and Kevin Cornell. The Terrible Two Get Worse. New York: Amulet Books, 2016.

MLA (9th ed.) Citation

Barnett, Mac, et al. The Terrible Two Get Worse. Amulet Books, 2016.