E. Anderson, Ikeokwu, and Foluke O. Adeniji. “Economic Burden of Illness Among the Self-Employed in the Commercial City of Port-Harcourt”. South Asian Journal of Social Studies and Economics 5, no. 3 (December 2, 2019): 1-13. Accessed July 9, 2020. https://journalsajsse.com/index.php/SAJSSE/article/view/30145.