1. Endodontology; biologic considerations in endodontic procedures;Seltzer,1971
2. The relationship of systemic diseases to endodontic failures and treatment procedures;Bender;Oral Surg,1963
3. A textbook of oral pathology;Shafer,1974
4. Pathology;Robbins,1967
5. Thoma's oral pathology;Gorlin,1970