TY  - GEN
AU  - Checkland , Peter
TI  - Soft systems methodology :  a 30 year retrospective
SN  - 9780471986065 (PB)
U1  - 003 
PY  - 1999///
CY  - Chichester
PB  - John wiley and Sons
KW  - SOFT SYSTEM METHODOLOGY
KW  - SYSTEM THEORY
ER  -