Mijianti, Yerry, and Eka Nova Ali Vardani. “Penulisan Pengumuman Melalui WhatsApp Di Grup Kelas ”. Belajar Bahasa: Scientific Journal of the Indonesian Language and Literature Education Study Program, vol. 8, no. 1, May 2023, pp. 23-39, doi:10.32528/bb.v8i1.172.