2. Henry Ford and Samuel Crowther, My Life and Work, New York: Doubleday, Page, 1922.
3. W. J. Hopp and M. L. Spearman, Factory Physics, 3rd ed., Long Grove IL: Waveland Press, 2008.
5. “Bulletproof Quality Came Only After a Long Struggle.” Automotive News, October 2007; available at http://www.autonews.com/apps/pbcs.dll/article?AID=/20071029/ANA03/710290347#axzz2dYX6Cw9F.
6. Alan Robinson, Modern Approaches to Manufacturing Improvement: The Shingo System, New York: Productivity Press, 1990, p. 54.
7. From Roberta Russell and Bernard Taylor, Operations Management, 3rd ed. For website, see http://www.prenhall.com/divisions/bp/app/russellcd/PROTECT/CHAPTERS/CHAP15/HEAD01.HTM ...