Muksin, A., R. Ruwaida, Z. Arifin, A. N. Madyanti, and S. Safri. “Determinants of Customer’s Equity: An Empirical Studies on BPRS Customers in Ex Banyumas Residency Central Java”. International Review of Management and Marketing, vol. 8, no. 2, Mar. 2018, pp. 81-89, https://econjournals.com/index.php/irmm/article/view/6186.