Gunawan, I. G. D., P. Pranata, N. P. E. Merliana, H. E. Gantiano, and I. M. Y. Marantika. “The Use Of Ruang Guru Application As Online Teaching Communication Media In The New Normal Era”. Jayapangus Press Books, Aug. 2020, pp. 214-2, http://book.penerbit.org/index.php/JPB/article/view/474.