1. Abramo, C. (2008). How much do perceptions of corruption really tell us? Economics: The Open-Access, Open-Assessment E-Journal, 2, 3.
2. Acemoglu, D., & Robinson, J. (2012). Why nations fail: The origins of power, prosperity, and poverty. New York: Crown Business.
3. Andersson, S., & Heywood, P. M. (2009). The politics of perception: Use and abuse of transparency international’s approach to measuring corruption. Political Studies, 57(4), 746–767.
4. Annoni, P., & Dijkstra, L. (2013). EU Regional Competitiveness Index. Luxembourg, Europe.
5. Charron, N. (2010) Assessing the quality of the quality of government data: A sensitivity test of the world bank government indicators, QoG Working Paper. ( http://www.qog.pol.gu.se/digitalAssets/1357/1357980_paper-on-sensititivty-tests-of-world-bank-data.pdf ).