Suriani Binti Ismail, M. K. S. A. A. I. N. M. N. “Knowledge, Attitude and Practices of Oral Health Among Parents and Pre-School Children”. Opción, Vol. 35, Aug. 2019, pp. 1044-59, http://www.produccioncientificaluz.org/index.php/opcion/article/view/24567.