1. Department of Trade and Industry (DTI). Report. Assessment of broad age-related issues for package opening. Commissioned by the Consumer Affairs Directorate, March 1999 (http://www.dti.gov.uk/homesafetynetwork/pdf/packopen.pdf).
2. Department of Trade and Industry (DTI). Report. Assessment of problems related to package size. Commissioned by the Consumer Affairs Directorate, March 1999 (http://www.dti.goc.uk/homesafetynetwork/pg_rsize.htm).
3. Office of National Statistics (2004). 2001 Census, Ageing Population. January 2004 (http://www.statistics.gov.uk/cci/nugget.asp?id=949).
4. Pinch grip, power grip and wrist twisting strengths of healthy older adults
5. Can older adults use child resistant closures?