Hidayat R, Haryanto H, Sapinah P. Tunagrahita Student Learning Expert System with Backward Chaining Method at YKDW 01 Tangerang School. SinkrOn [Internet]. 2019Mar.5 [cited 2024Jul.16];3(2):32-8. Available from: https://jurnal.polgan.ac.id/index.php/sinkron/article/view/10020