Fadillah, Fitriani. “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, vol. 10, no. 2, Apr. 2022, pp. 2000-6, doi:10.35335/midwifery.v10i2.637.