James Horn, The Usability Methods Toolbox, online at http://www.best.com/~jthom/usability/.
Jakob Nielsen, Usability Engineering, Academic Press, 1993.
J.S. Dumas and Janice Redish, A Practical Guide to Usability Testing, Ablex, Norwood, NJ, 1993.
Lindgaard, G., Usability Testing and System Evaluation: A Guide for Designing Useful Computer Systems, Chapman and Hall, 1994.
Rubin, Jeffrey, Handbook of Usability Testing, John Wiley and Sons, 1994.
Cherri M. Pancake, Can Users Play an Effective Role in Parallel Tools Research? Oregon State University Technical Report 96-60-12, October 1996.
M. M. Gowda and Cherri M. Pancake, Basing Tools Design on User Feedback: The Lightweight Corefile Browser. Available online at http://www.engr.orst.edu/~pancake/papers/lcb/lcb.html.