Cita APA (7a ed.)

Chapman, S. G. (1998). Murdered on duty: The killing of police officers in America (2. ed.). Thomas.

Cita Chicago Style (17a ed.)

Chapman, Samuel G. Murdered on Duty: The Killing of Police Officers in America. 2. ed. Springfield, Ill: Thomas, 1998.

Cita MLA (8a ed.)

Chapman, Samuel G. Murdered on Duty: The Killing of Police Officers in America. 2. ed. Thomas, 1998.