1. Bailey, R. and Allan, R. and Raiello, P.(1992). Usability testing vs. heuristic evaluation: A head-to-head comparison. Human Factors and Ergonomics Society 36th Annual Meeting October12 – 161992. In [ pp. 409 - 413] . .
2. Boren, M. and Ramey, J. (2000) Thinking aloud: reconciling theory and practice IEEE Trans. Professional Communication, 43, pp. 261 - 278.
3. Cantani, M. and Biers, D.(1998). Usability evaluation and prototype fidelity: users and usability professionals. Human Factors and Ergonomics Society 42nd Annual Meeting October5 – 91998. In [ pp. 1331 - 1335] . .
4. Desurvire, H. and Kondziela, J. and Atwood, M.(1992) What is gained and lost when using evaluation methods other than empirical testing?. In People and Computers VII. ( pp. 89 - 102 ). Cambridge : Cambridge University Press.
5. Dumas, J. and Redish, J.(1999) A Practical Guide to Usability Testing. Bristol : Intellect Books.