Cita APA (7a ed.)

Cunningham, W. C., Strauchs, J. J., & VanMeter, C. W. (1991). Private security: Patterns and trends.

Cita Chicago Style (17a ed.)

Cunningham, William C., John J. Strauchs, y Clifford W. VanMeter. Private Security: Patterns and Trends. 1991.

Cita MLA (9a ed.)

Cunningham, William C., et al. Private Security: Patterns and Trends. 1991.