Sukamto, Sukamto, Liliek Triyono, Idhawati Hestiningsih, Mardiyono Mardiyono, and Parsumo Rahardjo. 2018. “RANCANG BANGUN SISTEM INFORMASI BUKU AJAR DARING BERBASIS WEB”. SINTAK 2 (November). https://www.unisbank.ac.id/ojs/index.php/sintak/article/view/6673.