Open University <br/><br/>
System modelling 

 - Walton  Hall Open University         1975 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>32135 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D65,8(B)0bX:89M, L5