<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/2014/07/11/140711081549_poverty_624x351_getty.jpg>
<http://www.bbc.com/mundo/noticias/2014/07/140708_eeuu_desigualdad_hispanos_mas_pronunciada_tsb.shtml>