Sources of international law

International law, also known as "law of nations", refers to the body of rules which regulate the conduct of sovereign states in their relations with one another. Sources of international law include treaties, international customs, general widely recognized principles of law, the decisions of national and lower courts, and scholarly writings. They are the materials and processes out of which the rules and principles regulating the international community are developed. They have been influenced by a range of political and legal theories.

The U.S. Department of State lists the "sources of international lawmaking" as including "treaties, executive agreements, legislation, Federal regulations, Federal court decisions, testimony and statements before Congressional and international bodies, diplomatic notes, correspondence, speeches, press conference statements, and even internal memoranda."