Williams, I 2007, 'Ideoleg ac estheteg yn y mudiad drama', Gwerddon, no. 2, pp. 87-103. <http://hdl.handle.net/2160/1156>

Williams, I 2006, Y Mudiad Drama, 1880-1940: Y Meddwl Ar Dychymyg Cymreig. Gwasg Prifysgol Cymru | University of Wales Press. <http://hdl.handle.net/2160/1212>

Williams, I 2005, 'Daniel Owen a 'Gwir Gychwyn' y Mudiad Drama', Llên Cymru, vol. 28, pp. 138-159. <http://hdl.handle.net/2160/1220>

Williams, I 2004, Towards national identities: Welsh theatres. in The Cambridge History of British Theatre. Cambridge University Press, pp. 242-272. <http://hdl.handle.net/2160/1152>