Cita APA (7a ed.)

George, B., & Button, M. (2000). Private security. Perpetuity Pr.

Cita Chicago Style (17a ed.)

George, Bruce, y Mark Button. Private Security. Leicester: Perpetuity Pr, 2000.

Cita MLA (8a ed.)

George, Bruce, y Mark Button. Private Security. Perpetuity Pr, 2000.