Nurhaeni, N., S. Chodidjah, R. Adawiyah, and A. Astuti. “Using a Mobile Application (‘PrimaKu’) to Promote Childhood Immunization in Indonesia: A Cross-Sectional Study”. Belitung Nursing Journal, vol. 7, no. 4, Aug. 2021, pp. 329-35, doi:10.33546/bnj.1524.