1. Handbuch der Anatomie des Hundes;Baum,1936
2. The Intervertebral Discs;Beadle,1931
3. The Ring Apophysis of the Human Vertebra;Bick;J. Bone Jt. Surg.,1951
4. The Differential Diagnosis of Canine Paraplegia;Boddie;Vet. Rec.,1949
5. The Intervertebral Disc;Bradford,1945