TY  - BOOK
AU  - Ackoff,Russell L.
AU  - Emery,F.E.(Frederick Edmund).
TI  - On purposeful systems
SN  - 0422740306
PY  - 1972///
CY  - London
PB  - Tavistock Publications
KW  - Social sciences
KW  - Methodology
KW  - Social systems
N1  - Includes bibliographies
ER  -