APA (7e ed.) Bronvermelding

Porter, W. T., & Perry, W. E. (1987). EDP, controls and auditing (5th ed.). Kent Pub. Co.

Chicago (17e ed.) Bronvermelding

Porter, W. Thomas, en William E. Perry. EDP, Controls and Auditing. 5th ed. Boston, Mass: Kent Pub. Co, 1987.

MLA (9e ed.) Bronvermelding

Porter, W. Thomas, en William E. Perry. EDP, Controls and Auditing. 5th ed. Kent Pub. Co, 1987.