Wilson, B. (2001). Soft systems methodology: Conceptual model building and its contribution. John Wiley and Sons.
Chicago-referens (17:e uppl.)Wilson, Brian. Soft Systems Methodology: Conceptual Model Building and Its Contribution. Chichester: John Wiley and Sons, 2001.
MLA-referens (9:e uppl.)Wilson, Brian. Soft Systems Methodology: Conceptual Model Building and Its Contribution. John Wiley and Sons, 2001.
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