Gultom, Desi Meliana, Evi Erianty Hasibuan, Elpiana Sari, and Fitria Lely Effina Batubara. “The Relationship Between Knowledge and Attitude of the Elderly in Handwashing As an Effort to Prevent Covid-19”. International Journal of Public Health Excellence (IJPHE) 1, no. 1 (January 27, 2022): 56–59. Accessed November 25, 2024. https://ejournal.ipinternasional.com/index.php/ijphe/article/view/13.