Schools of jurisprudence

 Philosophical school

Socrates, plato, aristotle

Historical school

 Savigny 

Custom - it is the law by itself it does not get recognition from the state . It is independent source .

Realistic school

Analytical school

They opposed the historical sources of law and established the legislation , percedent and statues would be the source of law. English jurists rejected customs.

 Jeremy bentham

Precedent - precedent are dogs law it does not exist until the dog disobeys.

 John Austin 

Custom - the custom is not source of law he rejects the historical use of law .

The custom receives its recognition from the courts which are precedent.

 salmond

Sociological school