Bintana, Rizqa, Putri Devi, and Umi Yuhana. “Return on Invesment (ROI) of Software Product: A Systematic Literature Review”. Ultima InfoSys : Jurnal Ilmu Sistem Informasi 6, no. 1 (June 30, 2015): 50-57. Accessed November 22, 2024. https://ejournals.umn.ac.id/index.php/SI/article/view/279.