Siddiqui, Ammar Pasha, Rozina Nazir, and Amjad Mahmood. 2017. “Effect of Sagittal Position of Maxilla and Maxillary Incisors Inclination on the Position of the Upper Lip”. Pakistan Orthodontic Journal 9 (1):8-14. https://poj.org.pk/index.php/poj/article/view/151.