| 1. | 
        
    Oxford : Oxford University Press, 2006.Second edition.
 | 
                | 2. | 
        
    Geneva, Switzerland : World Intellectual Property Organization, 1986. 
English | E 238N612 WIPO.B | 
 | 
                | 3. | 
        
    Frankfurt am Main : A. Metzner, 1987.Third edition.
 
English | N 621 SCH.H | 
 | 
                | 4. | 
        
    Cheltenham, UK : Edward Elgar, 2013. | 
                | 5. | 
        
    Cheltenham, UK : Edward Elgar, 2010. | 
                | 6. | 
        
    London : Sweet & Maxwell, 2002.Second edition.
 
English | N 40 DAV.C(2) | 
 |