O'Brien, J. A. (1997). Introduction to information systems (8th ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)O'Brien, James A. Introduction to Information Systems. 8th ed. Boston ; Chicago: Irwin, 1997.
Lua MLA (8ú heag.)O'Brien, James A. Introduction to Information Systems. 8th ed. Irwin, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.