def create_new_source
      @source ||= DataModel::Source.create(
          {
              base_url:          'http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0067980',
              site_url:          'http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0067980',