VARIA JUITA, Mersiana. Analisis Sistem Pengendalian Internal dalam Optimalisasi Sistem Pembelian pada PT. Mulia Safety Service Surabaya. Ascarya: Journal of Islamic Science, Culture, and Social Studies, [S. l.], v. 1, n. 2, p. 204–216, 2021. DOI: 10.53754/iscs.v1i2.88. Disponível em: https://journal.ascarya.or.id/index.php/iscs/article/view/88. Acesso em: 6 aug. 2026.