1. Chisholm, J. T. and A. G. Sutton.: Arch. Otolaryng. 2, 543–556, 1925.
2. Conant, N. F. and others: Manual of Clinical Mycology Philadelphia, Sunder, 1955.
3. Conley, J. J.: Arch. Otol, 47: 721–745, June 1948.
4. Fowler, E. P.: Medicine of the Ear, 2nd Ed. Pub: Nelson (N. Y.) 1948.
5. Gile, W. D. et al: Quoted in Otolaryngology, Ed. by Coates, 1948.