1. Economic and Labour Market Paper 2007/6;J Berg,2007
2. Høyland, B., Moene, K., & Willumsen, F. (2008). Be careful when doing business. Report for the Norwegian Ministry of Foreign Affairs. Oslo: ESOP.
3. World Bank. (2003). Doing business in 2004: Understanding regulation. Washington, DC: Author.
4. World Bank. (2010). Doing business 2011: Making a difference for entrepreneurs. Washington, DC: World Bank and International Finance Corporation.
5. World Bank Independent Evaluation Group. (2008). Doing business: An independent evaluation-taking the measure of the World Bank-IFC doing business indicators. Washington, DC: Author.