<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/2016/01/06/160106170248_idiomas_624x485_thinkstock_nocredit.jpg>
<http://www.bbc.com/mundo/noticias/2016/01/160106_monolinguismo_analfabetismo_siglo_xxi_ch>