Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Checkland, Peter, i Jim Scholes. Soft Systems Methodology in Action: A 30-year Retrospective. [New ed.]. Chichester, Eng., New York: Wiley, 1999.

Cita MLA (9th ed.)

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