Ahmad, I., M. M. Qadri, M. Niazi, T. Saleem, and U. Khalid. “A Survey of Oral Hygiene Practices Amongst Dental Students”. Pakistan Orthodontic Journal, vol. 9, no. 1, July 2017, pp. 50-55, https://mail.poj.org.pk/index.php/poj/article/view/159.