1. Dental Anatomy;Diamond,1929
2. Textbook of Dental Anatomy and Physiology;Wheeler,1940
3. Life and Work of James Leon Williams;Clapp,1925
4. Institute of Pedagogics, December 1903;Berry;Dentists’ Mag.,1906
5. Williams, J.L.: New Classification of Natural and Artificial Teeth. New York: Dentists’ Supply Company.