1. X-ray protection in the dental office;Richards;JADA,1958
2. Medical X-ray protection up to three million volts. National Bureau of Standards Handbook 76,1961
3. The effective use of X-ray radiation in dentistry;Barr;Oral Surg,1963
4. Guide to dental materials,1966
5. New method for the reduction of gonadal irradiation of dental patients;Richards;JADA,1962