Haryadi, R., M. Widiyanti, M. S. Shihab, and A. Maulana. “The Effect of Product Quality on Coal Purchase Interest through Sales-Based Non-KAI Logistics at PT Bukit Asam, TBK”. International Journal of Business, Economics and Management, vol. 7, no. 4, Nov. 2024, pp. 168-75, doi:10.21744/ijbem.v7n4.2326.