Gregory, P. H. (2012). All-in-one CISA certified information systems auditor exam guide (2nd ed.). Tata McGraw-Hill.

Gregory, Peter H. All-in-one CISA Certified Information Systems Auditor Exam Guide. 2nd ed. New York ; New Delhi: Tata McGraw-Hill, 2012.

Gregory, Peter H. All-in-one CISA Certified Information Systems Auditor Exam Guide. 2nd ed. Tata McGraw-Hill, 2012.