Jeffers, John N. R. <br/><br/>
An Introduction to systems analysis :    /  
Jeffers, John N. R. 
 - a ed. 
 - London ;   Edward Arnold ,   1978 
 - 198 p.  ;   22 cm. : il. :    
<br/><br/><label>ISBN: </label>713126531 
<br/><br/><label>Subjects--Index Terms: </label>ECOLOGY 
<br/><br/><label>Universal Decimal Class. No.: </label>574