1. Traumatic Injuries of the Teeth;Andreasen,1972
2. The Classification and Treatment of Injuries to the Teeth of Children;Ellis,1970
3. Endodontic Practice;Grossman,1963
4. Endodontics;Ingle,1967
5. Clinical, Radiographic and Histological Aspects of Intra-alveolar Fractures of Upper Central Incisors;Pindborg;Acta Odontol. Scand,1955