Cita APA (7a ed.)

Langman, P., & Langman, P. F. (2009). Why kids kill: Inside the minds of school shooters (1. ed.). Palgrave Macmillan.

Cita Chicago Style (17a ed.)

Langman, Peter, y Peter F. Langman. Why Kids Kill: Inside the Minds of School Shooters. 1. ed. New York, NY [u.a.]: Palgrave Macmillan, 2009.

Cita MLA (8a ed.)

Langman, Peter, y Peter F. Langman. Why Kids Kill: Inside the Minds of School Shooters. 1. ed. Palgrave Macmillan, 2009.