Denis,Grogan <br/><br/>
More case studies in reference work 
GroganDenis 
 - Clive Bingley Ltd.  London  1972 
 - 293 
<br/><br/><label>ISBN: </label>0 85157 124 7 
<br/><br/><label>Dewey Class. No.: </label>28.7  / G874M