Treaty FAQsBluebook treaty sourcesCitations, signatories, parties, status, subjectsUnited Nations CharterUnited Nations & League of Nations treatiesAdditional Multilateral, IGO & special subject treaty sourcesIf the U.S. is a partyBilateral treaties & treaty sources for other countriesCommentaries & travaux préparatoires (drafting history)Soft law
BITS: Bilateral investment treatiesICSID, NAFTA, WTO
The practice of international law by other statesU.S. practice of international law
Documents, legislation & cases, generallySelected country reports and booksUN human rights websites & search enginesUN Human Rights Council, Commission & CommitteeHuman rights sources for AfricaEuropean Union: Charter of Fundamental RightsCouncil of Europe: European Convention on Human RightsInter-American Court & Commission
I.C.J. and P.C.I.J.U.S. cases on international law
Official treaty sourcesUnofficial treaty sourcesTreaties in Force: Citations, signatories, parties, status, subjectsUpdating Treaties in Force: Citations, signatories, parties, status, subjectsPresidential statements, proclamations, etc.
Agreements, documents, legislation, & case law
Nuremberg TrialsICC International Criminal CourtICTY International Criminal Tribunal for the Former YugoslaviaICTR International Criminal Tribunal for RwandaSpecial Court for Sierra Leone
This is the "Customary IL & state practice" page of the "International Law: General Sources" guide.
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International Law: General Sources   Tags: foreign & international law, international law  

This guide lists essential sources for researching general aspects of international law. For specialized topics, such as human rights or international arbitration, see the guide International Law: Specialized Sources.
Last Updated: Nov 20, 2017 URL: Print Guide RSS Updates

Customary IL & state practice Print Page

Research strategies & sources

Winer, Customary International Law, Chap. 8, in International Law Legal Research, suggests this research strategy: (1) look in books, articles and cases on your issue to see if they identify those few treaties, General Assembly resolutions and judicial decisions that are considered to be direct statements of customary law; and (2) look in the following: books, articles, Restatement 3d Foreign Relations of the U.S., and International Law Commission materials: Identification of customary international law, draft agreements, principles and articles and the Analytical Guide to the Work of the International Law Commission, for statements of what the author thinks are the customary rules on an issue.

(3) If you have not found statements of what is customary law on your issue, then continue your research by looking for sources that provide evidence of state practice, opinio juris, jus cogens, and any other related factors. This tab lists sources for the practice of international law by other states and for U.S. practice of international law. See also Humanitarian law/Law of war.

Use the other tabs of this research guide to locate any specific sources that you need, e.g., treaties, case law, etc.

The following guides also suggest strategies and specific sources for researching customary international law.

Selected books & articles on custom & state practice

See also
Books, working papers, etc. 
Law reviews, journals, articles


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