Permadi, A. “PENGUKURAN MATURITY LEVEL CONTROL OBJECTIVE KE-5 DOMAIN DELIVERY AND SUPPORT : ENSURING SYSTEM SECURITY MENGGUNAKAN FRAMEWORK COBIT 4.1”. Jurnal Matematika MANTIK, vol. 1, no. 1, Nov. 2015, pp. 37-42, doi:10.15642/mantik.2015.1.1.37-42.