A.D. Adesina, and D.S. Ogaji. “Out-of-Pocket Payment for Healthcare and Implications for Households: Situational Analysis in Yenagoa, Bayelsa State”. Journal of Community Medicine & Primary Health Care, vol. 32, no. 1, Mar. 2020, pp. 1-16, https://jcmphc.org/index.php/jcmphc/article/view/47.