TY  - BOOK
AU  - Checkland,Peter
TI  - Systems Thinking, Systems Practice : Includes an 30-Year Retrospective
SN  - 0471986062
AV  - Q295 C514 S9 1999
PY  - 1999///
CY  - New York
PB  - John Wiley & Sons
KW  - System theory
ER  -