Julianingsih, Intan, et al. “Analysis of the Implementation of the Basic Immunization Program for Infants During the Covid-19 Pandemic in the Work Area of the Bukittinggi City Health Office ”. Science Midwifery, vol. 10, no. 5, Dec. 2022, pp. 4331-4, doi:10.35335/midwifery.v10i5.1061.