Joseph, G., da Silva, I. C. M., Fink, G., Barros, A. J. D., & Victora, C. G. (2018). Absolute income is a better predictor of coverage by skilled birth attendance than relative wealth quintiles in a multicountry analysis: Comparison of 100 low- and middle-income countries. BMC Pregnancy Childbirth.

Joseph, Gary, Inácio C. M. da Silva, Günther Fink, Aluisio J. D. Barros, and Cesar G. Victora. "Absolute Income Is a Better Predictor of Coverage By Skilled Birth Attendance Than Relative Wealth Quintiles in a Multicountry Analysis: Comparison of 100 Low- and Middle-income Countries." BMC Pregnancy Childbirth 2018.

Joseph, Gary, et al. "Absolute Income Is a Better Predictor of Coverage By Skilled Birth Attendance Than Relative Wealth Quintiles in a Multicountry Analysis: Comparison of 100 Low- and Middle-income Countries." BMC Pregnancy Childbirth 2018.