Sunandar , Hery, Berto Nadeak, Pristiwanto, and Saidi Ramadan Siregar. 2020. “EXPERT SYSTEM FOR TROUBLESHOOTING LAPTOP MOTHERBOARD DAMAGE USING FORWARD CHAINING METHOD AT BUDI DARMA UNIVERSITY COMPUTER LAB”. INFOKUM 9 (1,Desember), 50-55. http://infor.seaninstitute.org/index.php/infokum/article/view/80.