1. 1966 Morris' human anatomy, 12h. ed., McGraw-Hill Book Company, New York, p. 1405.
2. 1658 (Cited from: Skillern, R. H. 1920 Accessory sinuses of the nose, 2d. ed., Lippincott Company, Philadelphia, pp. 24-26.)
3. 1502 (Cited from: Wright, J. 1914 A history of laryngology and rhinology, 2d. ed., Lea and Febiger Company, Philadelphia and New York, pp. 167-170.)