Astuti, Luh Gede, and Gede Aditya Mahardika Pratama. “The Expert System Design to Identify Laptop Damage by Applying Certainty Factor Method”. International research journal of engineering, IT & scientific research 7, no. 4 (July 31, 2021): 165–175. Accessed July 16, 2024. https://sloap.org/journals/index.php/irjeis/article/view/1898.