1. The OECD List of Social Indicators. OECD, Paris, 1982.
2. World Energy Assessment: Energy and the Challenge of Sustainability. United Nations Development Program (UNDP), New York, 2000.
3. World Development Indicators. World Bank, 2013.
4. Lifetime earnings and the Vietnam era draft lottery: evidence from social security administrative records;Angrist;Am. Econ. Rev.,1990
5. Estimating the labor market impact of voluntary military service using social security data on military applicants;Angrist;Econometrica,1998