beginning, cause, root; see origin 2, 3.
A person or work supplying information
expert, specialist, authorization, source material; see reference 3.
spring, reservoir, fount; see origin 2. See syn. study at origin.
"source." YourDictionary, n.d. Web. 20 May 2018. <http://thesaurus.yourdictionary.com/SOURCE>.
source. (n.d.). Retrieved May 20th, 2018, from http://thesaurus.yourdictionary.com/SOURCE
A point of origination:
An acquaintance who is in a position to help: