For more in-depth information, the reader is referred to:
Brassard, Michael & Diane Ritter. The Memory Jogger II: A Pocket Guide of Tools for Continuous Improvement & Effective Planning. Methuen, MA: GOAL/QPC, 1994.
Executive Learning, Inc. Continual Improvement Handbook: A Quick Reference Guide for Tools and Concepts(Healthcare Version). Brentwood, TN: Executive Learning, Inc., 1993.
Langley, Gerald J., Ronald Moen, Kevin M. Nolan, Thomas W. Nolan, Clifford L. Norman, & Lloyd P. Provost. The Improvement Guide: A Practical Approach to Enhancing Organizational Performance. San Francisco: Jossey-Bass, 2009.