1. A method for identifying a primary document version of a document from a plurality of document versions of the document, the method, executed by a computer system and comprising: storing, by the computer system, a source-priority list comprising a plurality of document sources, each source having an associated priority of authority, where the priorities include higher priorities and lower priorities; accessing, by the computer system, at least one data repository to obtain metadata for each document version of the document versions; determining, by the computer system and based on the metadata, a source of each document version; determining, by the computer system, from the source-priority list, a priority of authority for the source of each document version; selecting, by the computer system, a document version, of the document versions, having the source with a highest priority of authority and a qualified citation count based on a citation count measure; providing, by the computer system, the document version having the source with a highest priority of authority for presentation.
7. The method of claim 1 , where the citation count for the document version is based on a sum of a citation count of each document version of the document versions.