Williams Mari A., Parry Gwenfair (ed.) The Welsh Language and the 1891 Census

University of Wales Press, 1999. — 509 p. — ISBN 0–7083–1536–4The 1891 census was the first to collect information about the language spoken by the people of Wales, and is therefore a particularly reliable source for historians analyzing the socio-economic structure of Weslh- and English-language ability and the process of language change in Wales at the end of the 19th century.