Haag, S. (2006). Information systems essentials. Boston: McGraw-Hill.
Chicago Style aipamenaHaag, Stephen. Information Systems Essentials. Boston: McGraw-Hill, 2006.
MLA aipamenaHaag, Stephen. Information Systems Essentials. Boston: McGraw-Hill, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.