Lubis, Nuraini, Abdul Mujib, and Yenni Sriwahyuni. 2020. “GURU KELILING (GULING) PADA MASA PANDEMI COVID-19”. Integral : Pendidikan Matematika 11 (2):28-39. https://e-journal.umc.ac.id/index.php/JNR/article/view/1752.