Fadillah, Fitriani. 2022. “Relationship Of Knowledge With Parents’ Perceptions About Covid-19 Vaccination In Children In The UPTD Puskesmas Area Sri Padang Tebing Tinggi Year 2022”. Science Midwifery 10 (2):2000-2006. https://doi.org/10.35335/midwifery.v10i2.637.