Nasution, Zulkarnain, 		Frida, Ester, AND 		Bulolo, Olina.
" PENGETAHUAN SIKAP DAN TINDAKAN LANSIA TENTANG PENCEGAHAN COVID-19 DI DUSUN III DESA BANGUN SARI KECAMATAN TANJUNG MORAWA KABUPATEN DELI SERDANG" <em>JURNAL DARMA AGUNG HUSADA</em> [Online], Volume 9 Number 2 (31 October 2022)