1. Technical correspondence;Allen;Communications of the ACM,1985
2. The International Directory of Graphic Symbols;Arnstein,1983
3. The Psychology of Human-Computer Interaction;Card,1983
4. Evaluating pictograms using semantic differential and classification techniques;Caron;Ergonomics,1980
5. Metaphor and the cognitive representation of computer systems;Carroll;IEEE Transactions on Systems, Man & Cybernetics,1982