Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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