"Public international law governs the relationships between national governments and intergovernmental organizations. It regulates governments and intergovernmental organizations across national boundaries." Marci Hoffman and Katherine Topolos, International Legal Research Tutoria: Public International Lawl (last visited Jan. 23, 2013).
a. International Conventions, whether general or particular, establishing rules expressly recognized by the contesting states;
b. International Custom, as evidence of a general practice accepted as law;
c. the General Principles of Law recognized by civilized nations;
d. 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.
Article 38, ¶ 1. of the Statute of the International Court of Justices