Google books: sphenoidal conchae: General Anatomy and Osteology of Head and Neck (I. K. International Pvt Ltd, 2009; by Mahdi Hasan)- Retrieved 2018-08-29 https://books.google.com/books?id=9mTtP0FFVekC&dq=Sphenoidal+conchae&pg=PA185 ↩