E. W. Handayani, Dyah Aryani Perwitasari, and Fredrick Dermawan Purba, “Parental Acceptance of the COVID-19 Vaccine for Children Aged 6-11 Years: A Phenomenological Approach Based on the Health Belief Model (HBM)”, J Liaq Uni Med Health Sci, vol. 25, no. 03, pp. 160–166, Jun. 2026.