1. ‘Everyday aids and appliances — walking sticks’;Mulley;British Medical Journal,1988
2. British Standard Specification for Fixed Height Walking Frames. BS4986, 1973.
3. British Standard Specification for Adjustable Height Walking Frames. BS5104, 1974.
4. ‘The energy costs of walking using two types of walking frame’;Hamzeh;Clinical Rehabilitation,1988
5. Walking Frames;Mayfield,1984