Aritonang, Nurvida, and Ernawati Siagian. “Pengetahuan, Sikap Dan Upaya Terhadap Pencegahan Covid-19”. Jurnal Penelitian Perawat Profesional 3, no. 4 (October 28, 2021): 717-726. Accessed November 8, 2026. http://jurnal.globalhealthsciencegroup.com/index.php/JPPP/article/view/610.