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 April 18, 2026. https://www.jurnal.globalhealthsciencegroup.com/index.php/JPPP/article/view/610.