Cita APA (7a ed.)

Langman, P. (2015). School shooters: How to recognize schoolroom and campus killers before they attack. Rowman & Littlefield.

Cita Chicago Style (17a ed.)

Langman, Peter. School Shooters: How to Recognize Schoolroom and Campus Killers Before They Attack. Lanham [u.a.]: Rowman & Littlefield, 2015.

Cita MLA (9a ed.)

Langman, Peter. School Shooters: How to Recognize Schoolroom and Campus Killers Before They Attack. Rowman & Littlefield, 2015.