TY  - BOOK
AU  - Ackoff Russell L
AU  -  Emery Ered E
TI  - On purposeful systems
SN  - 422 74030 6
U1  - SN1, L2 
PY  - 1972///
CY  - London
PB  - Tavistock Publication UK        
KW  - Psychology
N1  - Bib at the end of each chapter; Appendix  p 265-80
ER  -