Source

Quelle

(the person, place or thing from which something (information, goods, etc.) comes or is acquired)

Quelle

(spring etc.)

Quelle

(informant)

Ursprung

(the person, place or thing from which something (information, goods, etc.) comes or is acquired)

belegen

(to obtain or procure; used especially of a business resource)

beziehen

(to obtain or procure; used especially of a business resource)