<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/05/28/130528084704_truong_duy_nhat_464x261_truongduynhatfacebook.jpg>
<http://bbcvietnamese.com/vietnamese/forum/2013/05/130528_hieu_ung_truong_duy_nhat.shtml>