APA-viite

Bernard, D. (1977). Charging For Computer Services: Principles and Guidelines. Petrocell.

Chicago-tyylinen lähdeviittaus

Bernard, Dan. Charging For Computer Services: Principles and Guidelines. New York: Petrocell, 1977.

MLA-viite

Bernard, Dan. Charging For Computer Services: Principles and Guidelines. Petrocell, 1977.