Clayden, David and others <br/><br/>
The hard systems approach systems models 

 - Walton Hall  ; The Open University Press  , 1984 
 - 158p. 
<br/><br/><label>ISBN: </label>0335171745  £9.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hard Systems<br/>Systems<br/>Systems Theory
<br/><br/><label>Dewey Class. No.: </label>003  / CLA