Wilson Samosir. “The Implementation of the Posyandu Program and Complete Infant Immunization at the Tiga Balata Community Health Center”. International Journal of Public Health Excellence (IJPHE) 2, no. 2 (April 3, 2023): 492–495. Accessed November 24, 2024. https://ejournal.ipinternasional.com/index.php/ijphe/article/view/361.