Pal, A., J. Yadav, S. ., and K. J. Singh. “Factors Associated With Unmet Need of Family Planning in Bihar, India: A Spatial and Multilevel Analysis”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 7, no. 9, Aug. 2018, pp. 3638-45, doi:10.18203/2320-1770.ijrcog20183768.