Bilal, R., B. Arjumand, S. Raheem, O. Shabir, and Q. Kanwal. “Smile As Perceived by Orthodontists and General Practitioners”. Pakistan Orthodontic Journal, vol. 2, no. 2, Dec. 2010, pp. 60-65, https://www.poj.org.pk/index.php/poj/article/view/5.