1. S. Tribess, Jair Sinda Virtuoso Junior, and R. J. d. Oliveira, Physical Activity as a Predictor of Absence of Frailty in the Elderly, 58 (2012) 341-347.
2. Information on http: /www. clhio. ca/how-affordable-tools-and-technology-will-help-our-ageing-population-stay-independent-longer.
3. R. Q. Barros, M. M. Soares, and M. G. Fernandes, Ergonomic Evaluation of Manual Force Levels of the Elderly in the Handling of Products: An Analysis Using Virtual Reality, (2014).
4. R. Kumar, Ergonomic Evaluation and Design of Tools in Cleaning Operation, Doctoral Thesis, Department of Human Work Sciences, Luleå University of Technology, (2006).
5. J. L. Fozard, J. A. M. Graafmans, J. Rietsema, H. Bouma, and A. v. Berlo, Aging and Ergonomics: The Challenges of Individual Differences and Environmental Change, in Human Factors and Ergonomics Society Europe Chapter Annual Meeting, Soesterberg, The Netherlands, (1993).