N. Kalu-Umeh, Nnennaya, Mohammed N. Sambo N. Sambo, Suleiman H. Idris, and Abubakar M. Kurfi​. “Costs and Patterns of Financing Maternal Health Care Services in Rural Communities in Northern Nigeria: Evidence for Designing National Fee Exemption Policy”. International Journal of Maternal and Child Health and AIDS 2, no. 1 (November 13, 2015): 163–172. Accessed October 19, 2026. http://www.mchandaids.org/index.php/ijma/article/view/311.