Purnomo, Agus Heri, Raden Andi Sularso, and Ahmad Roziq. “The Effect of Competence, Organizational Commitment, and Perceived Organizational Support towards Service Quality and Working Group Performance of Procurement Service Unit in Ministry of Finance of Indonesia”. International Journal of Social Sciences and Humanities Invention 5, no. 5 (May 30, 2018): 4733–4741. Accessed May 3, 2024. https://valleyinternational.net/index.php/theijsshi/article/view/1258.