1. Recommendations in radiographic practices: an update, 1988;Council on Dental Materials, Instruments and Equipment;JADA,1989
2. The application of ALARA for occupational exposures;National Council on Radiation Protection and Measurements,1999
3. Limitation of exposure to ionizing radiation;National Council on Radiation Protection and Measurements,1993
4. Operational radiation safety program;National Council on Radiation Protection and Measurements,1998
5. The selection of patients for X-ray examinations: dental radiographic examinations;Lireka,1987