1. Through the interface: a human activity approach to user interface design;Bødker,1991
2. Visual perception: physiology, psychology and ecology;Bruce,1990
3. Body icons and product semantics;Bush,1990
4. The practical side of a theory – an approach to the application of product semantics;Butter,1990
5. An outline of a theory of affordances;Chemero;Ecological Psychology,2003