1. BSI (1989) Environmental Cleanliness in Enclosed Spaces, BS 5295, Parts 1-3, British Standards Institution, London.
2. GSA (1988) Clean Room and Work Station Requirements, Controlled Environment, Federal Standard FED-STD-209D, General Services Administration, Washington, D.C.
3. Collins, C.H. and Grange, J.M. (1990) The Microbiological Hazards of Occupations, Occupational Hygiene Monograph No. 17, Science Reviews, Middlesex, UK.
4. HSC (1992) Workplace (Health, Safety and Welfare) Regulations, Approved Code of Practice, Health and Safety Commission, HSE Books, Sudbury, UK.
5. HSE (1987) Lighting at Work, HS(G) 38, Health and Safety Executive, HSE Books, Sudbury, UK.