1. Observations on an Ethnic Classification of Idiots;Down;Lond. Hosp. Rep.,1866
2. Recognizable Pattern of Human Malformations;Smith,1988
3. Oral Pathology Clinical Pathologic Correlations;Regezi,1989
4. Down-Syndrom im Kindes-und Jugendalter,2016
5. Dental caries and treatment needs of Yemeni children with down syndrome;Al-Maweri;Dent. Res. J.,2014