Sinaga, R. L., and Leonard Roberto Sinaga. “Effect of Service Quality on Customer Satisfaction at PT. PLN (Persero) Rayon Siborong Borong Sibolga Area”. Jurnal Mantik, vol. 4, no. 4, Feb. 2021, pp. 2512-6, doi:10.35335/mantik.Vol4.2021.1201.pp2512-2516.