Cita APA (7a ed.)

Böckler, N., & Böckler, N. (2013). School shootings: International research, case studies and concepts for prevention. Springer.

Cita Chicago Style (17a ed.)

Böckler, Nils, y Nils Böckler. School Shootings: International Research, Case Studies and Concepts for Prevention. New York Heidelberg [u.a.]: Springer, 2013.

Cita MLA (8a ed.)

Böckler, Nils, y Nils Böckler. School Shootings: International Research, Case Studies and Concepts for Prevention. Springer, 2013.