1. Caffrey, J. G. (1970). Alternative Models for Higher Education. Paper presented at the 25th national conference of the American Association for Higher Education, March 3, 1970. Chicago, Illinois.
2. Checkland, P. (1985). Achieving 'Desirable and Feasible' Change: An Application of Soft Systems Methodology. The Journal of the Operational Research Society, 36(9), 821-831. Available online at: http://www.jstor.org/stable/2582171 [last accessed 07/04/10].
3. Critical issues in the use of Soft Systems Methodology: a case study in the long-term management of digital data objects.;A.Chilvers;Journal of Librarianship and Information Science,2000