Article 38(1) of the International Court of Justice (ICJ) Statute is generally considered to be the most authoritative enumeration of the sources of International law (Thomas Buergenthal & Sean Murphy, Public International Law in a Nutshell) Although it is no longer thought to be a complete enumeration of the sources of international law, it remains the best starting point.
Article 38(1) lists the sources of international law as:
Aside from the sources outlined in s. 38(1), there is significant scholarly discussion on other sources of international law such as ‘soft law’, unilateral declarations, principles of equity, and the secondary law of IGOs for example. For more on this topic see any of these works, as well as the treatises listed in the 'books' tab of this guide.
For a collection of articles on this topic see Martti Koskenniemi, ed., Sources of International law
Anne-Marie Slaughter, A New World Order
Jose E. Alvarez, International Organizations as Law-makers
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