QFD: The Customer-Driven Approach to Quality Planning and Deployment, Shigeru Mizuno and Yoji Akao, editors (Tokyo: Asian Productivity Organization, 1994).
Quality Function Deployment: How to Make QFD Work for You, Lou Cohen (Upper Saddle River, NJ: Prentice Hall PTR, 1995).
Basic Statistics: Tools for Continuous Improvement, Mark J. Kiemele, Stephen R. Schmidt, and Ronald J. Berdine, 4th edition (Colorado Springs, CO: Air Academy Press, 1997).