Dhar, R. S. G., J. Nagpal, S. Sinha, V. Bhargava, A. Sachdeva, and A. Bhartia. “Direct Cost of Maternity-Care Services in South Delhi: A Community Survey”. Journal of Health, Population and Nutrition, vol. 27, no. 3, Sept. 2009, pp. 368-7, doi:10.3329/jhpn.v27i3.3379.