Cita APA (7a ed.)

Spelman, W., & Brown, D. K. (1981). Calling the police: Citizen reporting of serious crime. Police Executive Research Forum.

Cita Chicago Style (17a ed.)

Spelman, William, y Dale K. Brown. Calling the Police: Citizen Reporting of Serious Crime. Washington, D.C: Police Executive Research Forum, 1981.

Cita MLA (8a ed.)

Spelman, William, y Dale K. Brown. Calling the Police: Citizen Reporting of Serious Crime. Police Executive Research Forum, 1981.