Sri Langgeng Ratnasari , Herni Widiyah Nasrul , Ishan Nurdin , Yuli Susilowati , Sulastri Manurung. “Employee Performance: Organizational Commitment, Motivation, Work Ability, and Work Environment”. International Journal of Advanced Science and Technology, Vol. 29, no. 10s, May 2020, pp. 1074 -84, https://sersc.org/journals/index.php/IJAST/article/view/14573.