LITERATURE
 

• Project control and organization by W.Hartman and J.Roos - Kluwer uitgeverij
• Operational Research by J.J.A. Bakker - Steinfeld and Kroese
• Information resources in the organization by J. Verhagen - Kluwer uitgeverij
• Belastinggids voor de kleine ondernemer - Belastingdienst Netherlands
• Illustrations with designprogram  Smart Draw - Copy Cats Software Netherlands