References
- Gibson , J. 1977 . “ The theory of affordances ” . In Perceiving, acting, and knowing: Toward an ecological psychology , Edited by: Shaw , R. and Bransford , J. 67 – 82 . Hillsdale, NJ : Lawrence Erlbaum Associates .
- Gibson , J. 1979 . The ecological approach to human perception , Boston, MA : Houghton Mifflin .