Purnama, Dian, Agustinus Wijaya, and Ariya Cahyono. “Performance Analysis Of Information System/Information Technology Using COBIT 4.1”. Journal of Information Systems and Informatics 2, no. 1 (March 11, 2020): 105-113. Accessed December 19, 2025. https://journal-isi.org.adsii.or.id/index.php/isi/article/view/48.