Damanik, E., Y. T. Simanjuntak, and D. Y. Wiratma. “PENCEGAHAN CORONA VIRUS DISEASE 19 (COVID-19) PADA PEDAGANG PASAR HELVETIA KELURAHAN HELVETIA TENGAH”. Jurnal Abdimas Mutiara, vol. 1, no. 2, Sept. 2020, pp. 8-11, https://e-journal.sari-mutiara.ac.id/index.php/JAM/article/view/1323.