The teachings and writings of respected scholars are important in civil law systems and carry weight in international law. They are useful as research aids. They attempt to collect, analyze and sometimes criticize the principles of international law derived from other sources.
For a listing of scholarly writing see the "Essential Sources" section of the International Legal Research Tutorial provided by Duke University School of Law and University of California, Berkeley, School of Law.
Judicial decisions of courts having international jurisdiction are a subsidiary source of international law. Cases dealing with international law may also be found in the national reports of various countries. The secondary importance of case law is in keeping with the practice of civil law systems.
International Court of Justice
Court of Justice of the European Union (CJEU)
European Court of Human Rights
Domestic Case Law