Spitta, Thorsten; Borchers, Jens (2004): IT-Controlling und Outsourcing. Software management 2004, Outsourcing and integration. Bonn: Gesellschaft für Informatik e.V.. PISSN: 1617-5468. ISBN: 3-88579-383-0. pp. 139-141. Regular Research Papers. Bad Homburg. November 2004
