1. Terming, encoding and grouping;Read;Medinfo,1995
2. Utilisation and outcome in the medical patient referred to surgery;Munoz;Am J Surg,1989
3. A language of health in action: read codes, classifications and groupings;Stuart-Buttle,1996
4. Tabular list of the classification of surgical operations and procedures;Office of Population Censuses and Surveys,1990
5. International Classification of diseases. 9th Edition.