<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/02/10/130210185804_manchester_united_everton_robinvan_persie_giggs_10022013_304x171_reutes.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2013/02/130214_ultnot_deportes_economia_manutd_ingresos_tsb.shtml>