Open University <br/><br/>
Systems modelling 

 - Walton  Hall Open University         1979 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>31389 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D65,8(B)0bX:89M, L9