1. G. C. Andrews(1954 ) Diseases of the Skin . 4th ed. , p.270 . PhiladelphiaandLondon: W. B. Saunders Company.
2. S. W. Becker, and M. E. Obermayer(1947 ) Modern Dermatology and Syphilology , p.493 . Philadelphia, London, Montreal: J. B. Lippincott Company.
3. Manual of Clinical Mycology