* [http://www.congreso.es/portal/page/portal/Congreso/Congreso/SDocum/ArchCon/SDHistoDipu/SDBuscHisDip?_piref73_1340033_73_1340032_1340032.next_page=/wc/servidorCGI&CMD=VERLST&BASE=DIPH&FMT=DIPHXLSS.fmt&DOCS=1-100&DOCORDER=FIFO&OPDEF=Y&QUERY=%2887670.NDIP.%29 Ficha no Congreso dos Deputados] {{Webarchive|url=https://web.archive.org/web/20190915130900/http://www.congreso.es/portal/page/portal/Congreso/Congreso/SDocum/ArchCon/SDHistoDipu/SDBuscHisDip?_piref73_1340033_73_1340032_1340032.next_page=%2Fwc%2FservidorCGI&CMD=VERLST&BASE=DIPH&FMT=DIPHXLSS.fmt&DOCS=1-100&DOCORDER=FIFO&OPDEF=Y&QUERY=%2887670.NDIP.%29 |date=15 de setembro de 2019 }}
* [http://el.tesorodeoviedo.es/index.php?title=Ram%C3%B3n_P%C3%A9rez_Costales Ramón Pérez Costales] ''Enciclopedia de Oviedo''.
