Bhatti, Sajid Nazir, et al. “TRANSNASAL ENDOSOCPIC REPAIR OF CEREBROSPINAL FLUID RHINORRHOEA”. Journal of Ayub Medical College Abbottabad, vol. 23, no. 2, June 2011, pp. 15-17, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/2522.