SYAHNA A, F.; WIYONO, W.; HAKIM, B. P. 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, [S. l.], v. 4, n. 2, p. 1158–1165, 2024. DOI: 10.47467/visa.v4i2.3444. Disponível em: https://journal-laaroiba.com/ojs/index.php/visa/article/view/3444. Acesso em: 28 apr. 2026.