Villiger, Mark E. <br/><br/>
Customary international law and treaties  a manual on the theory and practice of the interrelation of sources /  [Texte imprimé] : 
Mark E. Villiger 
 - 2nd rev. ed. 
 - London:  Kluwer Law International,  1997 
 - 346 p. ;  24 cm 
<br/><br/> Index 
<br/><br/><label>ISBN: </label>90-411-0458-5 
<br/><br/><label>Dewey Class. No.: </label>341.75