1. Origins of dental radiography;Fortier,1982
2. Wilhelm Conrad Roentgen and the early history of the Roentgen rays;Glasser,1934
3. Roentgen's revolution: the discovery of the X-ray;Grey,1973
4. Radiographic science for technologists;Bushong,1975
5. W.C. Roentgen and the discovery of the Roentgen rays;Glasser;Amer J Roentgenol Radium Ther,1931