1. Barthes R. (1964). Rethorique de l’image. Communications, 4, 40-50.
2. de Beaugrande R., Dressler W. (1983). Introduction to text linguistics. London-New York: Longman.
3. Dormann C. (1994). Self-explaining icons. Digital creativity, 5, 81-85.
4. Ferreira J. (2004). Semiotic explorations in user interface design. www.mcs.vuw.ac.nz/comp/pdf.
5. Ferreira J., Noble J. and Biddle R. (2005).The semiotics of user centered design. www.mcs.vuw.ac.nz/∼jennifer/chapter- iwos .pdf.