Villiger, Mark E. <br/><br/>
Customary international law and treaties. 

 - Dordrecht :  Martinus Nijhoff,  1985. 
 - Developments in international law;v.7 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9024729807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vienna convention on the law of treaties(1969).<br/>Customary law, international.<br/>Treaties.