1. Definitions, Models, Classifications, Schemes, and Applications
2. Cambridge Research Systems, 2009. Variantor™ dichromatic spectacles [online]. Available from:http://www.variantor.co.uk/faqitem.php?id=11[Accessed 12 November 2009]
3. Cardoso, C. and Clarkson, P. J. Impairing designers: using calibrated physical restrainers to empathise with users. Proceedings of 2nd international conference for universal design UD2206. Edited by: Kose, S. pp.217–226. Kyoto: International Association for Universal Design.
4. Participatory design in community informatics