1. Histopathological Investigations of the Dental Granuloma;Freeman;J. Dent. Res,1931
2. Histopathological Investigation of the Dental Granuloma;Schroff;J. Dent. Res,1931
3. A Textbook of Oral Pathology;Shafer,1974
4. Endodontics;Ogilvie,1976
5. Endodontic Therapy;Smulson,1976