Final answer:
The sources of international law include customs, treaties, and judicial decisions from international courts.
Step-by-step explanation:
The sources of international law include customs, treaties, and judicial decisions from international courts.
Customs: Customary international law is derived from the long-time practices of states. For example, the custom of diplomatic immunity is based on a long-standing practice of granting certain privileges and immunities to diplomats.
Treaties: Treaties are formal agreements entered into by states, which create legally binding obligations. The Universal Declaration of Human Rights is an example of a treaty that establishes human rights standards for all nations.
Judicial decisions: Judicial decisions from international courts, such as the International Court of Justice, contribute to the development of international law by interpreting and applying existing rules. These decisions serve as precedents for future cases.