‘WILLIAMS, Iolo Aneurin’, Who Was Who, A & C Black, an imprint of Bloomsbury Publishing plc, 1920–2016; online edn, Oxford University Press, 2014; online edn, April 2014 accessed 8 April 2016
‘WILLIAMS, Iolo Aneurin’, Who Was Who, A & C Black, an imprint of Bloomsbury Publishing plc, 1920–2016; online edn, Oxford University Press, 2014; online edn, April 2014, accessed 8 April 2016]