TY  - BOOK
AU  - Ackoff,Russell L.
AU  - Emery,Fred E.
TI  - On purposeful systeme
U1  - 300.182 
PY  - 1972///
CY  - [London]
PB  - Tavistock
KW  - Social sciences
KW  - Statistical methods
N1  - Includes index
ER  -