'For Wales our Country' - Arwel Vittle, co-author of a new book on the foundation of Plaid Cymru, 'Dros Gymru'n Gwlad', discusses how a group of young people founded the party in 1925 and why it didn't it happen earlier? 

* 'Dros Gymru'n Gwlad: Hanes Sefydlu Plaid Genedlaethol Cymru', Arwel Vittle a Gwen Angharad Gruffudd -

https://www.ylolfa.com/products/9781800997066/dros-gymrun-gwlad-hanes-sefydlu-plaid-genedlaethol-cymru

* Dros Gymru'n Gwlad (Finlandia) - https://www.youtube.com/watch?v=NViE2h0_1PY 

* ‘Putting Wales First’ by Richard Wyn Jones

https://www.uwp.co.uk/book/putting-wales-first-rw-jones/