APA
(2007). Soft Systems Methodology. New York: John Wiley and Sons, Ltd.
Chicago
2007. Soft Systems Methodology. New York: John Wiley and Sons, Ltd.
Harvard
(2007). Soft Systems Methodology. New York: John Wiley and Sons, Ltd.
MLA
Soft Systems Methodology. New York: John Wiley and Sons, Ltd. 2007.