APA (7th ed.) Citation

Grogan, J., & Cowdrey, R. (2011). Trick or treat, Marley! (First edition.). Harper.

Chicago Style (17th ed.) Citation

Grogan, John, and Richard Cowdrey. Trick or Treat, Marley! First edition. New York: Harper, 2011.

MLA (8th ed.) Citation

Grogan, John, and Richard Cowdrey. Trick or Treat, Marley! First edition. Harper, 2011.

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