S. Sultan, D. S. Atmaja, and S. Y. Husein, “???? ?????? ????? ????? ??????? ?? ???? ??????? 4.0 ??? ??? 5 (LMS) ??????? ???????? ?????? ???? ????? ??????”, eltsa, vol. 20, no. 2, pp. 115–130, Jan. 2022.