Siallagan, Asihon, et al. “Customer Preference Analysis: Why Are R1 450VA Electricity Customers Not Interested in Increasing Power? (A Case Study of PT PLN Batam Customers)”. Dinasti International Journal of Economics, Finance & Accounting, vol. 6, no. 4, Sept. 2025, pp. 3313-2, doi:10.38035/dijefa.v6i4.5152.