B. A. Laksono, M. N. Sitaresmi, and R. R. Arisanti, “Factors affecting differences in measles-rubella bias immunization during the COVID-19 pandemic and before the COVID-19 pandemic in Kulon Progo District 2020”, BKM-PHCM, vol. 38, no. 02, pp. 37-42, Feb. 2022.