Evi, Evi Lutfiyana, and Rilla Gantino. “Implementation Audit Internal of Quality Management System Iso 9001:2015 in the Purchasing Activities Technical Department at Pt Sango Indonesia”. Journal of Economics, Finance and Accounting Studies 5, no. 2 (April 8, 2023): 75–88. Accessed September 27, 2025. https://al-kindipublishers.org/index.php/jefas/article/view/5072.