1. Nieberle and Cohrs' textbook of the special pathologic anatomy of domestic animals;Cohrs,1967
2. Tumours of the upper alimentary tract;Head;Bull World Health Organ,1976
3. The alimentary system;Barker,1985
4. Colyer's variations and diseases of the teeth of animals,1990
5. Oral examination and diagnosis: management of oral diseases;Baker,1985