언어
http://ons.gov.uk/ons/rel/census/cyfrifiad-2011/ystadegau-allweddol-ar-gyfer-awdurdodau-unedol-yng-nghymru/stb-2011-key-statistics-for-wales---welsh.html
http://ons.gov.uk/ons/rel/census/cyfrifiad-2011/ystadegau-allweddol-ar-gyfer-awdurdodau-unedol-yng-nghymru/stb-2011-key-statistics-for-wales---welsh.html
어원
왈라키아 공국 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%99%88%EB%9D%BC%ED%82%A4%EC%95%84_%EA%B3%B5%EA%B5%AD