1. Act No. 137/2006 Coll., on Public Contract.
2. Act of Public Procurement Law (PPL) adopted on 29th January 2004, with further amendments. http://www.uzp.gov.pl/cmsws/page/?F;370 (20.02.2015).
3. G. Ang,., M. Groosman, N.P.M. Scholten (2005). Dutch performance-based approach to building regulations and public procurement, Building Research & Information, 33:2 (2005) 107-119.
4. N. Banaitiene, A. Banaitis, (2006). Analysis of criteria for contractors’ qualification evaluation, Technological and Economic Development of Economy, 12:4 (2006) 276-282.
5. Bulletin of Contracts. http://www.vestnikverejnychzakazek.cz.