1. Dens in Dente;Poyton;Dent. Radiogr. Photogr,1966
2. Dens in Dente;Shafer;N. Y. State Dent. J,1953
3. The incidence, Nature, and Clinical significance of Palatal Invaginations in the Maxillary Incisor Teeth;Hallet,1953
4. Incidence of the Small Dens in Dente;Amos;J. Am. Dent. Assoc,1955
5. Dental Anatomy;Fujita,1966