Rahman, B., M. Widiyanti, M. S. Shihab, and A. Rosa. “The Effect of Service Quality and Coal Price Perceptions on Customer Satisfaction at PT Bukit Asam, TBK”. International Journal of Social Sciences, vol. 7, no. 4, Nov. 2024, pp. 113-20, doi:10.21744/ijss.v7n4.2327.