Khan, A., U. Hussain, A. Ayub, and N. Iqbal. “Patterns of Skeletal Class II in Patients Reporting to Khyber College of Dentistry”. Pakistan Orthodontic Journal, vol. 5, no. 1, June 2013, pp. 19-22, https://poj.org.pk/index.php/poj/article/view/74.