Sinaga, Johanes, and Ernawati Siagian. “Pengetahuan Covid-19 Berhubungan Dengan Tingkat Kecemasan Tenaga Pendidik”. Jurnal Penelitian Perawat Profesional 3, no. 4 (December 22, 2021): 807-818. Accessed April 18, 2026. https://www.jurnal.globalhealthsciencegroup.com/index.php/JPPP/article/view/704.