APA (7th ed.) Citation

Cullen, D. (2009). Columbine (1. ed.). Twelve.

Chicago Style (17th ed.) Citation

Cullen, David. Columbine. 1. ed. New York [u.a.]: Twelve, 2009.

MLA (9th ed.) Citation

Cullen, David. Columbine. 1. ed. Twelve, 2009.