- Marc Rettig, “Prototyping for Tiny Fingers”, http://portal.acm.org/citation.cfm?id=175288
- Carolyn Snyder, “Paper Prototyping: The Fast and Easy Way to Design and Refine User Interfaces”
- Bill Buxton, “Sketching User Experiences”
- 6.831 • “User Interface Design and Implementation”, http://courses.csail.mit.edu/6.831/readings.php