WELLA, Wella; SETIAWAN, Johan. Audit Sistem Informasi Menggunakan Cobit 4.1 pada PT. Erajaya Swasembada, Tbk. Ultima InfoSys : Jurnal Ilmu Sistem Informasi, [S. l.], v. 6, n. 2, p. 111–124, 2015. DOI: 10.31937/si.v6i2.227. Disponível em: https://ejournals.umn.ac.id/index.php/SI/article/view/227. Acesso em: 2 aug. 2025.