1. Report on Dental Materials and Devices;American Dental Association Council;J. Am. Dent. Assoc.,1978
2. Opinions of patients concerning the danger of an oral roentgenographic examination and reaction of patients to the use of a lead rubber apron. Review of the literature;Eselman;Oral Surg.,1966
3. Health and Safety at Work Act,1974
4. Fundamentals of Dental Radiography;Manson-Hing,1979
5. Code of Practice for the Protection of Persons against Ionising Radiations arising from Medical and Dental Use;National Radiological Protection Board,1972