In order to make it easy for the community to check a number of references we suggest we should offer a little WikidataGame. It would show a statement plus a potential reference and ask if it is an appropriate reference or not.
Games available at: https://tools.wmflabs.org/wikidata-game/distributed/
Documentation for adding a new game: https://bitbucket.org/magnusmanske/wikidata-game/src/master/public_html/distributed/?at=master
Fallback if this doesn’t work: paste on wiki page