Purnamasari, Yessy Sabilla, Sri Mujiyono, and Fiktina Vifri Ismiriyam. “Expert System for The Diagnosis of Depression in Students Using Certainty Factor Method: A Case Study of Ngudi Waluyo University”. Journal of Information Systems and Informatics 7, no. 1 (March 30, 2025): 909–923. Accessed March 7, 2026. https://www.journal-isi.org/index.php/isi/article/view/950.