1. A textbook of oral hygiene and preventive dentistry;Bunting,1950
2. The preventive concept: its critical significance;Kauffmann;Bull NY Soc Dent Child,1955
3. Preventive dentistry;Muhler,1954
4. Gelatine forming microorganisms;Black;Independent Practitioner,1886
5. The presence of bacterial plaques on the surface of teeth, and their significance;Miller;Dent Cosmos,1902