1. The applied anatomy of the frontal sinus
2. Skillern R. H.: Accessory Sinuses of the Nose, Ed. 3, Philadelphia and London, J. B. Lippincott Co., 1920, p. 251–252.
3. Hajek M.: Diseases of the Nasal Accessory Sinuses, Ed. 5, Vol. II, St. Louis, C. V. Mosby Co., 1926, p. 322–325, 342–343.
4. Lederer F. L.: Diseases of the Ear, Nose and Throat, Ed. 2, Rev., Philadelphia, F. A. Davis Co., 1939, p. 399–400.
5. THE TWO-STAGE OPERATION FOR SUPPURATIVE FRONTAL SINUSITIS WITH EXTERNAL MANIFESTATIONS