APA (7th ed.) Citation

Kloepfer, J., & Wolfhard, S. (2011). Sludgment day. Harper.

Chicago Style (17th ed.) Citation

Kloepfer, John, and Steve Wolfhard. Sludgment Day. New York: Harper, 2011.

MLA (8th ed.) Citation

Kloepfer, John, and Steve Wolfhard. Sludgment Day. Harper, 2011.

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