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Public international law – body of rules and procedures intended to govern relations between nation state
Private international law – rules that determine where, and by whose law, controversies involving more than one jurisdiction are resolved, and how foreign judgments are enforced
Foreign law – law of specific foreign countries (or of inter-governmental organizations such as the EU)
Comparative law – study of the differences and similarities among national legal systems
Sources of International Law
According to the Statute of the International Court of Justice art. 38, June 26, 1945, 59 Stat. 1055, 33 U.N.T.S. 993:
Treaties – international conventions, whether general or particular, establishing rules expressly recognized by the contesting States;
Customary international law – international custom, as evidence of a general practice accepted as law;
General principles of law – the general principles of law recognized by civilized nations;
Judicial decisions and teaching of “publicists” – judicial decisions and the teachings of the most highly qualified publicists of the various nations, as subsidiary means for the determination of rules of law.