Systems modelling: Systems, models and decisions 

 - Milton Keynes  Open University Press  1979 
 - 72p. 
<br/><br/><label>ISBN: </label> UKP 3.75 
<br/><br/><label>Source: </label> UKP 3.75 
<br/><br/><label>Dewey Class. No.: </label>600 SYS