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

Scholarly Works

Article 38 of the ICJ Statutes lists the writings of international law scholars as the last source of international law. But these works are generally the best place to start researching an international law project because they can help you find and recognize rules in other sources such as treaties.

Essential Sources lists dictionaries and encyclopedias, research guides, bibliographies and indexes, and selected international law treatises, periodicals, publications of scholarly international law associations, and internet sources.

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Review Questions

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