Sour, K.G <br/><br/>
Publishers' International ISBN Directory Vol.3; Numeriacal ISBN section 

 - 29 
 - Berlin  International ISBN Agency  2002 
 - 1-1630 
<br/><br/><label>ISBN: </label>3-598-21620-3 
<br/><br/><label>Universal Decimal Class. No.: </label>018.4(058)(100)  / SAU.3.02