1. Checkland, P. (1981), Systems Thinking, Systems Practice, Chichester, UK: Wiley.
2. Checkland, P., Poulter, J. (2006), Learning for Action: A Short Definitive Account of Soft Systems Methodology, and Its Use Practitioners, Teachers and Students, Chichester, UK: Wiley.
3. Checkland, P., Scholes, J. (1990), Soft Systems Methodology in Action, Chichester, UK: Wiley.