[9] Europese Commissie, DG Regionaal beleid, "Guidance on the methodology for carrying out cost-benefit analysis, 2007-2013 – Evaluation Unit Working Document n. 4", te vinden op [http ...]
[9] European Commission, DG for Regional Policy, 'Guidance on the methodology for carrying out cost-benefit analysis', 2007-2013 - Evaluation Unit Working Document n. 4, available at [http ...]