1. Alen, A. M.: Laryngoscope, 45, 620, 1935.
2. Alexander, H. L.: Journal of Allergy, 7, 87, 1935.
3. Bauwen, P. : Index of Treatment, Hutchinson 8 Hilton, 13th edition, 1948.
4. Banhan, T. M.: Conservative treatment of chronic suppurative Otitis Media in Adults. J. Laryngol & Otol, 59, 117, 1944.
5. Beck, J. C. & Gutman, M. R. : “Physical Therapy in Otolaryngology” in Principle and practice of physical Therapy.