1. Incidence of the Retrocuspid Papilla;Easley;J. Dent. Child,1970
2. Retrocuspid Papilla;Everett;Periodontics,1965
3. The Retrocuspid Papilla;Hirshfeld;Am. J. Orthod,1947
4. Oral Diagnosis;Kerr,1970
5. Periodontal Disease in Children and Adolescents;Baer,1974