Ginting, R. U., Hestina, and E. Gultom. “Edukasi Trello Bagi Guru Di SDN 060937 Kotamadya Medan”. Jurnal Abdimas Mutiara, vol. 4, no. 1, Feb. 2023, pp. 108-12, https://e-journal.sari-mutiara.ac.id/index.php/JAM/article/view/3704.