<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2011/09/29/110929141506_viet_workers_304x171_bbc_nocredit.jpg>
<http://bbcvietnamese.com/vietnamese/vietnam/2013/05/130529_viet_workers_saudi.shtml>