- "Handbook of Usability Testing" by Rubin J. and Chisnell, D.
- "A Practical Guide to Usability Testing" by Dumas, J. and Redish, J.
- "Don't Make Me Think" by Steve Krug
- "Usability Engineering" by Jakob Nielsen
For more suggestions, check out the Society for Technical Communication's Usability & User Experience Group's Bookshelf
Usability Testing Techniques