Sumito, Robi. “Decision-Making System for Selection of Majors in Higher Education Using the Certainty Factor (CF) Method for Web-Based High School Students”. International Journal Education and Computer Studies (IJECS) 1, no. 2 (December 30, 2021): 57–62. Accessed December 31, 2025. https://journal.lembagakita.org/ijecs/article/view/603.