whitten. (2004). Systems Analysis & design methods (6th Ed.). McGraw-Hill.
Chicago Style aipamenawhitten. Systems Analysis & Design Methods. 6th Ed. Boston: McGraw-Hill, 2004.
MLA aipamenawhitten. Systems Analysis & Design Methods. 6th Ed. McGraw-Hill, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.