Sulaiman, S. F. ., W. . Sururi, S. G. S. . Siregar, and A. . Yanti. “The Influence of Customer Service Skills and User Interface on Dana E-Wallet User Loyalty”. International Journal of Applied Finance and Business Studies, vol. 13, no. 4, Feb. 2026, pp. 660-7, doi:10.35335/ijafibs.v13i4.461.