Description of Hand Washing and Mask Wearing Knowledge during the Pandemic in Grade 4-5 School Children at Dolok Nagodang State Elementary School in 2021. Jurnal Indah Sains dan Klinis, [S. l.], v. 3, n. 2, p. 18–22, 2022. DOI: 10.52622/jisk.v3i2.50. Disponível em: https://ejournal.sumateraconnect.or.id/index.php/jisk/article/view/37.. Acesso em: 21 nov. 2024.