Hoamid, Abdo Ali, et al. “The Role of Customer-Focused Strategies to Improve Islamic Microfinance Institutions Performance: Empirical Evidence and Lessons from Yemen”. International Review of Management and Marketing, vol. 7, no. 1, Jan. 2017, pp. 291-9, https://mail.econjournals.com/index.php/irmm/article/view/3776.