• Ishikawa, K. (1982), Guide to Quality Control, Second revised english Edition, Tokyo: Asian Productivity Organization.

  • Karabatsos, N. A. (1989), “In Memoriam: Dr. Kaoru Ishikawa: Quality Organizer,” Quality Progress, 22, No. 6, 20.

  • Kume, H. (1985), Statistical Methods for Quality Improvement, Tokyo: AOTS Chosakai, Ltd.

  • Rodriguez, R. N. (1991), “Applications of Computer Graphics to Two Basic Statistical Quality Improvement Methods,” Proceedings of the National Computer Graphics Association Conference.

  • Sarazen, J. S. (1990), “The Tools of Quality, Part II: Cause-and-Effect Diagrams,” Quality Progress, 23, No. 7, 59–62.