Tarigan, Rindu Eka Bakti, Dr. Poerwaningsih Soekarno, M.STr, and Dr. Wilson , M.Si., M.A Rajagukguk. 2020. “ANALISA RISIKO OPERASIONAL DI DIVISI NETWORK OPERATION CENTER (NOC) PADA PT. INDOSAT OOREDOO”. JURNAL MANAJEMEN RISIKO 1 (2), 1-40. http://ejournal.uki.ac.id/index.php/mr/article/view/2791.