For the interested reader
- Checkland P B (1981), Systems Flunking, Systems Practice, Chichester, UB, Wiley.
- Crosby P B (1979), Quality is Free: ‘The Art of Making Quality Certain., New York, New American Library.
- Thompson W B (1995), Introduction to Witness and Linking to Process Mapping Tools. In Proceedings of the 1995 Winter Simulation Conference, ed C Alexopoulos, K Kang, W R Lilegdon and D Goldsman, Institute of Electrical and Electronics Engineers, Piscataway, New Jersey, 462–466.
- Wolstenholme E F (1990) System Enquiry: A System Dynamics Approach, Chichester, UK, Wiley.