Siddiqui, Ammar Pasha, Rozina Nazir, and Amjad Mahmood. “Effect of Sagittal Position of Maxilla and Maxillary Incisors Inclination on the Position of the Upper Lip”. Pakistan Orthodontic Journal 9, no. 1 (July 31, 2017): 8–14. Accessed May 12, 2025. https://poj.org.pk/index.php/poj/article/view/151.