Cita APA (7a ed.)

Leonard, J. D., & Telford, H. D. (1940). Police Instruction (A Measurement of Its Effectiveness).

Cita Chicago Style (17a ed.)

Leonard, John D., y H. D. Telford. Police Instruction (A Measurement of Its Effectiveness). 1940.

Cita MLA (9a ed.)

Leonard, John D., y H. D. Telford. Police Instruction (A Measurement of Its Effectiveness). 1940.