found: A raid i'r iaith ein gwahanu?, 1967:t.p. (Undeb Cymru Fydd; U.C.F.)
found: Charity Commission WWW site, viewed 20 February 2019(Undeb Cymru Fydd (New Wales Union) ; Charitable objects: The promotion of education in Wales and the promotion of the study of the Welsh language and literature)
found: Wicipedia, viewed 20 February 2019(Undeb Cymru Fydd was a cultural and patriotic society ; it was established in 1941 ; it was formed when Undeb Cenedlaethol y Cymdeithasau Cymreig and Pwyllgor Amddiffyn Diwylliant Cymru merged to establish a new organisation with the aim of promoting Welsh culture and the Welsh language ; the name is similar to the earlier patriotic organisation Cymru Fydd ; the union came to an end in 1969)