Wormald, P., & Gößler, U. (2016). The International Frontal Sinus Anatomy Classification (IFAC) and Classification of the Extent of Endoscopic Frontal Sinus Surgery (EFSS). International forum of allergy & rhinology, 6(7), . https://doi.org/10.1002/alr.21738
Chicago Style (17th ed.) CitationWormald, Peter-John, and Ulrich Gößler. "The International Frontal Sinus Anatomy Classification (IFAC) and Classification of the Extent of Endoscopic Frontal Sinus Surgery (EFSS)." International Forum of Allergy & Rhinology 6, no. 7 (2016). https://doi.org/10.1002/alr.21738.
MLA (9th ed.) CitationWormald, Peter-John, and Ulrich Gößler. "The International Frontal Sinus Anatomy Classification (IFAC) and Classification of the Extent of Endoscopic Frontal Sinus Surgery (EFSS)." International Forum of Allergy & Rhinology, vol. 6, no. 7, 2016, https://doi.org/10.1002/alr.21738.