This law arises from the practice of states in their international relations. Evidence of state practice is scattered and is generally not systematically recorded. Try these sources below.
Digest of International Law, Moore (1906), Hackworth (1940-1944), Whiteman (1963). At Law KC55
The practice of international organisations has become increasingly significant in recent years. Apart from the enormous volume of documentation produced by specific organisations, here are several useful general sources of practice.
|United Nations Legislative Series||"The legal materials contained in this series have included not only national legislation but also treaties, judicial decisions, diplomatic correspondence and other relevant materials depending on the topic." For example, "the law of the sea, the law of treaties, nationality, diplomatic and consular law, international organizations, State succession, non-navigational uses of international watercourses, jurisdictional immunities of States and their property, the multilateral treaty-making process as well as the prevention and suppression of international terrorism."|
|Yearbook of the International Law Commission||"Since its inception in 1949, the work product (documentation, reports, texts and instruments etc.) of the International Law Commission has accumulated into an extensive body of research into a wide range of aspects of public international law. The information on this site relating to such work product has been organized in a manner conducive to in-depth research."|
|Repertory of Practice of the United Nations Organs||"The Repertory, mandated by the General Assembly in resolution 796 (VIII) of 27 November 1953, is a legal publication containing analytical studies of the decisions of the principal organs of the United Nations."|
|United Nations Juridical Yearbook||" Includes certain documentary materials of a legal character concerning the United Nations and related intergovernmental organizations as presented in an outline annexed to the resolution."|
|New Zealand Ministry of Foreign Affairs and Trade, United Nations Handbook||The UN Handbook is a valuable reference guide that helps everyone working with or within the United Nations navigate the UN system effectively.|