Siregar, Z., H. Siregar, and D. Aldy. “Diseases of the Teeth of Children Attending the Outpatient Department in the Dr. Pirngadi General Hospital Medan”. Paediatrica Indonesiana, Vol. 20, no. 7-8, Dec. 2021, pp. 169-76, doi:10.14238/pi20.7-8.1980.169-76.