APA
Roper C., . (1999). Risk Management for Security Professionals. : Butterworth-Heinemann.
Chicago
Roper Carl, . 1999. Risk Management for Security Professionals. : Butterworth-Heinemann.
Harvard
Roper C., . (1999). Risk Management for Security Professionals. : Butterworth-Heinemann.
MLA
Roper Carl, . Risk Management for Security Professionals. : Butterworth-Heinemann. 1999.