O'Block, R. L. (1981). Security and crime prevention. Mosby.
Cita Chicago Style (17a ed.)O'Block, Robert L. Security and Crime Prevention. St. Louis: Mosby, 1981.
Cita MLA (9a ed.)O'Block, Robert L. Security and Crime Prevention. Mosby, 1981.
Precaución: Estas citas no son 100% exactas.
