Alpya, Lily, Elvina Elvina, and Mulya Rafika. “Human Resources Performance Improvement Through Motivation, Disipline, Work Environment, and Commitment in PT. Supra Matra Abadi PMKS Aek Nabara”. Quantitative Economics and Management Studies 3, no. 4 (July 13, 2022): 515–524. Accessed April 17, 2026. https://qemsjournal.org/index.php/qems/article/view/982.