Javierto, A.B., Hernandez, J.G. and Roldan, R.A. 2014. Foreign Body in the Sphenoid Sinus. Philippine Journal of Otolaryngology Head and Neck Surgery. 29, 2 (Nov. 2014), 46–47. DOI:https://doi.org/10.32412/pjohns.v29i2.443.