1. Periodontal therapy;Goldman,1960
2. Periodontology;Beube,1953
3. Clinical periodontology;Glickman,1958
4. Lefkowitz, William, and Robinson, H. B. G. Effectiveness of automatic and hand brushes in removing dental plaque and debris. J.A.D.A. this issue.
5. You can teach toothbrushing;American Dental Association,1960