Cita APA (7a ed.)

Callahan, W. T., & Knoblauch, R. (19). Prevention and control of collective violence. U.S. Dept. of Justice, Law Enforcement Assistance Administration.

Cita Chicago Style (17a ed.)

Callahan, William T., y Richard Knoblauch. Prevention and Control of Collective Violence. Washington, D.C: U.S. Dept. of Justice, Law Enforcement Assistance Administration, 19.

Cita MLA (9a ed.)

Callahan, William T., y Richard Knoblauch. Prevention and Control of Collective Violence. U.S. Dept. of Justice, Law Enforcement Assistance Administration, 19.