Most authoritative source of International law is:

Read the following paragraph and answer the following question:

A source of law within a domestic legal system is easier to determine. Within the domestic system it is considered as something which is not too difficult a process, where one may look at the various legislation or statutes provided for, by the legislature and if there is a lacunae in the statute then decisions of the domestic courts. But, it is not so easy to pin point the sources of international law.