1. Atkin (1974) Atkin, R.H. Mathematical Structure in Human affairs. Heinemann Educational Books.
2. Avison, Wood-Harper (1990) Avison, D.E. and Wood-Harper, A.T. Multiview, An Exploration in Information Systems Development. Alfred Waller Limited.
3. Checkland (1981) Checkland, P. Systems Thinking, Systems Practice. John Wiley.
4. Checkland (1990) Checkland P. Scholes, P. Soft Systems Methodology in Practice. John Wiley.
5. Earl (1996) MJ. Earl. Information equity A Model for Measuring performance in the Information Age. London Business School. CRIM WP96/2. URL http/www.lbs.ac.uk/crim/.