1. ANSI (American National Standard Institute), 1988. ANSI/HFS 100-1988. American National Standard for Human Factors Engineering of Visual Display Terminal Workstations, Human Factors Society, Santa Monica, CA.
2. Apple Computer, 1992. Macintosh Human Interface Guidelines. Addison-Wesley, Reading, MA.
3. Verbal protocol analysis;Bainbridge,1990
4. Managing to meet usability requirements;Bennet,1984
5. Visual displays;Bennet,1997