1. International Commission on Radiological Protection (2007) The 2007 Recommendations of ICRP. ICRP Publication 103. Annals of ICRP, 37, Elsevier, Oxford, UK.
2. Brooks S.L. and Atchison K.A (2004) Guidelines for prescribing dental radiographs. In White S.C. and Pharoah M.J . (eds.), Oral Radiology. Principles and Interpretation. Mosby, China, 5th edn, pp. 265–272.
3. European Commission (2009) Guidelines on Clinical Audit for Medical Radiological Practices (Diagnostic Radiology, Nuclear Medicine and Radiotherapy). Radiation Protection no 159, Directorate-General for Energy and Transport Directorate H-Nuclear Energy Unit H.4-Radiation Protection, Belgium.
4. European Commission (2004) European Guidelines on Radiation Protection in Dental Radiology. The Safe Use of Radiographs in Dental Practice. EC report 136, Brusseles, Belgium.
5. Board of the Faculty of Clinical Radiology. The Royal College of Radiologists (2006) Standards for the Reporting and Interpretation of Imaging Investigations. Royal College of Radiologists, London.