Batubara US, Nasution MIP. Immunization Servis Mobile Information System at Posyandu Medan Sunggal. J. Prisma. Sains [Internet]. 2023 Jul. 3 [cited 2025 Aug. 16];11(3):653-9. Available from: https://e-journal3.undikma.ac.id/index.php/prismasains/article/view/8395