Gwatkin, D. R.; Rutstein, S.; Johnson, K.; Suliman, E.; Wagstaff, A.; Amouzou, A. (December 2007). "Socio-economic differences in health, nutrition, and population within developing countries: an overview". Nigerian Journal of Clinical Practice10 (4): 272–282. பப்மெட்:18293634.
Prakash, A.; Swain, S.; Seth, A. (December 1991). "Maternal mortality in India: current status and strategies for reduction". Indian Pediatrics28 (12): 1395–1400. பப்மெட்:1819558.