Evi EL, Gantino R. Implementation Audit Internal of Quality Management System Iso 9001:2015 in the Purchasing Activities Technical Department at Pt Sango Indonesia. JEFAS [Internet]. 2023 Apr. 8 [cited 2025 Sep. 27];5(2):75-88. Available from: https://al-kindipublishers.org/index.php/jefas/article/view/5072