APA (7th ed.) Citation

Checkland, P., & Scholes, J. (1999). Soft systems methodology: A 30-year retrospective ([New ed.].). Wiley.

Chicago Style (17th ed.) Citation

Checkland, Peter, and Jim Scholes. Soft Systems Methodology: A 30-year Retrospective. [New ed.]. Chichester: Wiley, 1999.

MLA (9th ed.) Citation

Checkland, Peter, and Jim Scholes. Soft Systems Methodology: A 30-year Retrospective. [New ed.]. Wiley, 1999.