Customary International Law, General Principles of Law, and Other Sources

Research Guides & Background Information

Background Information

Department of State

Research Guides & Background Information


Domestic Law Concerning a Country's International Obligations

Resolutions, Declarations, and Legislative Acts of Intergovernmental

IGO yearbooks


Judicial Decisions of
International Tribunals

Court Decisions of Individual Countries Concerning International Obligations

Scholarly Works

Review Questions

IGO yearbooks

Many intergovernmental organizations (IGOs) publish yearbooks that survey their activities (e.g., Yearbook of the United Nations); in addition there are several useful yearbooks that cover the international law activities of various organizations.

Global Community: Yearbook of International Law and Jurisprudence includes both substantive articles on international law issues, decisions of international courts and tribunals (such as the International Court of Justice, the International Tribunal for the Law of the Sea, the World Trade Organization and the International Criminal Tribunal for the Former Yugoslavia), and a section on the contemporary practice of international law.

Hague Yearbook of International Law = Annuaire de La Haye de Droit International contains articles on international law issues and a section on the activities of international law institutions at the Hague ( International Court of Justice, the International Criminal Tribunal for the Former Yugoslavia and the Permanent Court of Arbitration, etc.).

Max Planck Yearbook of United Nations Law focuses on UN activities in the field of international law.