1. Young W. O., Striffler D. F., and Burt B., Dentistry, Dental Practices and the Community (3rd Edition), W. B. Saunders Co., Philadelphia, pp. 512–520, 1983.
2. Young W. O. and Striffler D. F., The Dentist, His Practice, and His Community (2nd Edition), W. B. Saunders Co., Philadelphia, pp. 346–349, 1996.
3. Effectiveness of dental health educational programs in schools
4. The Prevalence of Dental Caries in Europe 1990-1995