1. Morphology of Root Canals;Skillen;J. Am. Dent. A,1932
2. Endodontics; a Biophysical Approach;Albert,1953
3. Fundamentals of Dental Histology and Embryology Including Clinical Applications;Bodecker,1944
4. Descriptive Anatomy of the Human Teeth;Black,1902
5. Anatomy of the Root Canals of Teeth of the Permanent Dentition;Hess,1925