The document discusses the sources of international law as outlined in Article 38 of the Statute of the International Court of Justice. The four main sources are: 1) international conventions and treaties, 2) international customs, 3) general principles of law, and 4) judicial decisions and writings of publicists. Treaties can be either law-making or contractual. Customary international law requires consistent state practice and opinio juris. General principles fill gaps where no positive laws exist. Judicial decisions and writings are considered subsidiary sources.