@book{UBHD-1042708, author={Thirlway, Hugh W. A.}, title={International customary law and codification}, subtitle={an examination of the continuing role of custom in the present period of codification of international law}, publisher={Sijthoff}, address={Leiden}, year={1972}, pages={XII, 158 S.}, language={eng}, isbn={90-286-0082-5 and 978-90-286-0082-9}, library={UB [Signatur: 72 B 4002]}, }