1. Mouth protectors for contact sports;Cathcart;D. Digest,1951
2. 1954-55 handbook of the National Federation of State High Schooi Athletic Associations. Chicago, The Federation.
3. Report of Joint Committee on Mouth Protectors of the American Association for Health, Physical Education and Recreation and the American Dental Association,1961
4. Results of studies made by National Federation and several state associations on mandatory tooth and mouth protector equipment during 1962 season,1963
5. Mouth protectors: 1962 and the future;J.A.D.A.,1963