Nurmayni, and Fitriani Pramita Gurning. “Faktor Yang Mempengaruhi Implementasi Program Vaksinasi Covid-19 Di Kabupaten Labuhanbatu Selatan”. Tropical Public Health Journal 2, no. 2 (September 30, 2022): 107–111. Accessed August 16, 2025. https://idjpcr.usu.ac.id/trophico/article/view/10135.