Saragih, Hamzah, Risna Saragih, and Khoiruddin Matondang. 2021. “Peningkatan Kualitas Pembelajaran Jarak Jauh (PJJ) Berbasis FOCQIPOTU”. Jurnal Cendekia : Jurnal Pendidikan Matematika 6 (1), 94-106. https://doi.org/10.31004/cendekia.v6i1.1018.