1. United Nations Economic and Social Council (ECOSOC), May 20, 1998
2. http://www.unesco.org/most/acc4pov.htm
3. The Economics of Poverty: History, Measurement, and Policy 1st Edition by Martin Ravallion
4. The Measure of Poverty, A Report to Congress as Mandated by the Education Amendments of 1974, US Department of Health, Education and Welfare, Washington DC, April 1976, p. 13.
5. Schorr, A. L. (ed.), Jubilee for our Times: A Practical Program for Income Equality, Columbia University Press, 1977, pp. 15-16.