While we have removeClaims as a function for ItemPages, there is no removeSources to remove a source that belongs to a claim.
It would be needed to create a function for item pages, and for the underlying site.py function removeSources to be created to call the api with
https://www.wikidata.org/w/api.php - action=wbremovereferences as the action.
Version: core-(2.0)
Severity: enhancement
Whiteboard: gci2013 https://www.mediawiki.org/wiki/Google_Code-In#Candidate_tasks