Herawan Hayadi, B, Adolf Bastian, Kasman Rukun, Nizwardi Jalinus, Yaslinda Lizar, and Asriwan Guci. 2018. “Expert System in the Application of Learning Models With Forward Chaining Method”. International Journal of Engineering & Technology 7 (2.29): 845-48. https://doi.org/10.14419/ijet.v7i2.29.14269.