Syahna A, Fayza, Wiyono Wiyono, and Bela Pitria Hakim. “Perancangan Standard Operating Procedure (SOP) Audit Internal Berdasarkan Persyaratan ISO 9001:2015 Dan ISO 14001:2015 Menggunakan Metode Business Process Improvement”. VISA: Journal of Vision and Ideas 4, no. 2 (July 5, 2024): 1158–1165. Accessed April 28, 2026. https://journal-laaroiba.com/ojs/index.php/visa/article/view/3444.