Diseases of the Ear
Third Edition, Chap. 13, p. 349, 1974. , Williams & Wilkins Co. , Baltimore., Mawson,S.R.,et al, 1974
Infections of the Nervous System, (Bacterial, Fungal, Spirochetal, Parasitic) and Sarcoidosis, Subdural Empyema
Adams & Victors Principles of Neurology, Chp 32, pg 711, Ropper, A.H.,et al, 2014