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International Law: International Custom

Sources

Article 38(1) of the Statute of the International Court of Justice is widely recognised as the most authoritative and complete statement as to the sources of international law.

a) International conventions;
b) International custom, as evidence of a general practice accepted as law;
c) The general principle of law recognised by civilised nations;
d) Judicial decisions; 
e) Teachings of the most highly qualified publicists of the various nations