APA

Checkland P., Scholes J., . (1999). Soft Systems methodology in action. New York: John Wiley and Sons, LTD.

Chicago

Checkland Peter, Scholes Jim, . 1999. Soft Systems methodology in action. New York: John Wiley and Sons, LTD.

Harvard

Checkland P., Scholes J., . (1999). Soft Systems methodology in action. New York: John Wiley and Sons, LTD.

MLA

Checkland Peter, Scholes Jim, . Soft Systems methodology in action. New York: John Wiley and Sons, LTD. 1999.