Prasetyo, D., M. I. Wahyuddin, and R. T. Komalasari. “Expert System to Diagnose Human Heart Disease Using Web-Based Forward Chaining Method: Expert System to Diagnose Human Heart Disease Using Web-Based Forward Chaining Method”. Jurnal Mantik, vol. 3, no. 4, Feb. 2020, pp. 513-21, https://iocscience.org/ejournal/index.php/mantik/article/view/605.