Manurung, Erda, and Nurhayati Siagian. “Hubungan Pengetahuan Dengan Kecemasan Siswa SMA Swasta Advent Pematang Siantar Terhadap Pandemi Covid-19”. Nursing Inside Community 3, no. 1 (January 7, 2021): 8-14. Accessed December 22, 2024. https://jurnal.stikesnh.ac.id/index.php/nic/article/view/372.