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Researching Public International Law  

An introductory guide to researching public international law as defined by Article 38 of the ICJ statute.
Last Updated: May 1, 2013 URL: http://libguides.law.ucla.edu/publicinternationallaw Print Guide RSS UpdatesEmail Alerts

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Important Note About Access to Databases

Be sure to read the Database Access Guide carefully before beginning your research.

Useful Links

  • Globalex
    Repository of research guides on international, comparative, and foreign legal research.
  • EISIL
    Free online searcheable database of international law information with links to authentic primary materials and authoritative web sites.
  • ASIL Electronic Research Guide
    Provides information and links to primary documents for a variety of important international law topics.
 

What is International Law?

International Law, according to the Restatement of the Law (Third), the Foreign Relations of the United States, "consists of rules and principles of general application dealing with the conduct of states and of international organizations and with their relations inter se, as well as with some of their relations with persons, whether natural or juridical."

More basically, International law refers to the law governing interactions between nations.  International law can be divided into two distinct categories:

Public International law focuses on relationships between nations and citizens of different nations as governed by various inter-governmental organizations, such as the United Nations and NATO, and other sources of law such as treaties and custom.  For example, a dispute over a waterway between two nations would be governed by Public International law. 

Private International law is synonymous with the concept of "conflict of laws"; that is, it refers to legal disputes, typically involving private citizens, in which jurisdictional issues are the primary area of inquiry.   For example, a contract dispute between citizens of two different countries would likely be governed by Private International law. 

This guide focuses on Public International Law, but because the two areas overlap, some resources may also be helpful in researching Private International Law.

 

Sources of International Law

Article 38 of the Statute of the International Court of Justice establishes five distinct sources of international law:

  1. international conventions, whether general or particular, establishing rules expressly recognized by the contesting states; 

  2. international custom, as evidence of a general practice accepted as law;  

  3. the general principles of law recognized by civilized nations; 

  4. subject to the provisions of Article 59, judicial decisions and the teachings of the most highly qualified publicists of the various nations, as subsidiary means for the determination of rules of law.

Note that only the first three categories, international conventions (i.e. treaties), international custom, and the general principles of law recognized by civilized nations, are considered primary sources of law.  Case law and scholarly works are considered "subsidiary" sources of law and thus are not necessarily binding.

When faced with a research problem in Public International law, you will need to consult some or all of these sources, depending on the issue at hand.

 

Research Strategy

Approaching a research problem in Public International Law shares many similarities to approaching an American legal research problem though the materials used may differ.

  1. Consult secondary sources such as encyclopedias, research guides, and treatises to get an overview of your subject and the areas where you need to search as well as citations to primary materials.

  2. If you are researching a particular international organization, look for their web-site as many organizations have vast collections of primary documents on the web.

  3. Locate and analyze primary law, such as treaties, and subsidiary sources of public international law such as scholarly writings.  Remember that in public international law, cases are NOT considered primary law, though in practice they are often treated with great deference and are an excellent source for determining customary international law or "general principles" of international law.

  4. Make sure your research is up to date.

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