Bonington, Chris. <br/><br/>
Everest South West Face /  

 - Reprinted 1979 /  
 - England :   Penguin Books Ltd. ,   1970 
 - p.368 :  
<br/><br/><label>ISBN: </label>0-14-00.3933-3 
<br/><br/><label>Dewey Class. No.: </label>0111,3N34w  / L3