Javierto, Alvin B., Josefino G. Hernandez, and Rodante A. Roldan. “Foreign Body in the Sphenoid Sinus”. Philippine Journal of Otolaryngology Head and Neck Surgery 29, no. 2 (November 30, 2014): 46–47. Accessed April 28, 2024. https://pjohns.pso-hns.org/index.php/pjohns/article/view/443.