RAMADEVI.K, and P.THIRUMALAIKOLUNDUSUBRAMANIAN. “DEVELOPMENTAL DELAY AND MENTAL RETARDATION IN PATIENTS WITH INHERITED METABOLIC DISORDERS”. International Journal of Pharma and Bio Sciences, vol. 7, no. 3, Sept. 2016, pp. 1005-8, https://ijpbs.net/index.php/journal/article/view/5337.