Ackoff, Russell L.  1919- <br/><br/>
On purposeful systeme / 
Russell L. Ackoff and Fred E. Emery 
 - [London] :  Tavistock,  c1972 
 - xii, 288 p. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label> PND 3.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Statistical methods
<br/><br/><label>Dewey Class. No.: </label>300.182