Manurung, Melva Epy Mardiana. “Mom’s Knowledge Regarding Basic Immunization To Babies In The Sigumpar Public Health Center Area Year 2021”. Science Midwifery, vol. 10, no. 1, October, Sept. 2021, pp. 103-7, https://midwifery.iocspublisher.org/index.php/midwifery/article/view/149.