Principles and Basic Concepts of Equity and Health
.
  Bambas A., Casas J.A., 1999. División de Salud y Desarrollo Humano. Organización
  Panamericana de la Salud.
 

  Health Inequalities and the Health of the Poor: What Do We Know? What Can We Do?
  Gwatkin, D.,2000. The World Bank: Washington.
 

  Challenging Inequities In Health: From Ethics to Action.
  Edited by Timothy Evans, Margaret Whitehead, Finn Diderichsen, Abbas Bhuiya and Meg Wirth
  Oxford University Press, New York
 

  Desigualdades en la Mortalidad Infantil en la Región de las Américas: Elementos Básicos
  para el Análisis
  Castillo- Salgado C., Loyola E., Roca A. Boletín Epidemiológico, Vol. 22 No. 2, junio 2001,
  Organización Panamericana de la Salud.
 

  Health inequalities and social group differences: What should we measure?
  Murray, C.J.L.; Gakidou,E.E. & Frenk, J., 1999. Bulletin of the World Health Organization,
  77:53-543.
 

  On the measurement of inequalities in health
  Wagstaff A., Paci P., van Doorslaer E. 1991. Social Science and Medicine 33:545-577
 

  Development as Freedom
  Sen A.K. 1999. New York: Alfred A. Knopf