1. Cox, K., Walker, D.: User interface design. Prentice-Hall, Englewood Cliffs (1993)
2. Baum Engineering SRL: Welcome to Gnopernicus! (consulted January 10, 2006), available at
http://www.baum.ro/gnopernicus.html
3. Freedom Scientific BLV Group: JAWS(r) for Windows(r) Quick Start Guide, 11800 31st Court North, St. Petersburg, Florida 33716-1805 USA (2005)
4. ISO: Ergonomics of human-system interaction – Guidance on accessibility for human-computer interfaces, Technical Specification ISO TS 16071 (2003)
5. AENOR: Computer applications for people with disabilities. Computer accessibility requirements. Software (Spanish title: Aplicaciones informáticas para personas con discapacidad. Requisitos de Accesibilidad al Ordenador. Software), Spanish Standard UNE 139802 (2003)