Ufuoma John Ejughemre. “Out of Pocket Spending for Healthcare Services: A Study Assessing the Relationship Between Payment Methods and Perceived Satisfaction With the Quality of Care in a Tertiary Health Facility in Delta State, Nigeria”. Journal of Community Medicine & Primary Health Care, vol. 27, no. 1, Mar. 2015, pp. 27-36, https://jcmphc.org/index.php/jcmphc/article/view/154.