The referrer details returned by Flickr.StatsGetCollectionReferrers(DateTime, string, string, int, int), Flickr.StatsGetPhotoReferrers(DateTime, string, string, int, int), Flickr.StatsGetPhotosetReferrers(DateTime, string, string, int, int) and Flickr.StatsGetPhotostreamReferrers(DateTime, string, int, int).