Masood ahmed khan, H., D. F. Z. . Nasurdeen, and D. A. . Vallipuram. “A Cross-Sectional Survey on Knowledge, Attitude and Practice in Parents With Down Syndrome Children”. Pakistan Journal of Rehabilitation, vol. 11, no. 1, Jan. 2022, pp. 27-36, http://ojs.zu.edu.pk/ojs/index.php/pjr/article/view/947.