Dyfyniad APA

(1990). Soft system methodology in action. Chichester, Eng: Wiley.

Dyfyniad Arddull Chicago

Soft System Methodology in Action. Chichester, Eng: Wiley, 1990.

Dyfyniad MLA

Soft System Methodology in Action. Chichester, Eng: Wiley, 1990.

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