1. BS 5555: 1981/ISO 1000–1981, Specification for SI units and recommendations for the use of their multiples and of certain other units
2. Handbook of Chemistry and Physics,1988
3. Lord Robens Committee, Health and Safety at Work, HMSO, London (1972) and ‘The Health and Safety at Work etc. Act 1974’
4. Industrial Hazard and Safety Handbook;King,1980
5. The Institution of Chemical Engineers, Nomenclature for Hazard and Risk Assessment in the Process Industries, Rugby (1985)