TY  - BOOK
AU  - Checkland, Peter.
TI  - Soft systems methodology: a 30-year retrospective: 30-year retrospective
SN  - 471986054
U1  - 003.54 CHEP 
PY  - 2003///
CY  - New York
PB  - John Wiley & sons
KW  - Software System Analysis&Design
ER  -