^Steven Blandford (2007). Film, drama and the break-up of Britain. Intellect Books. s. 171. ISBN978-1-84150-150-5. Besøkt 24. desember 2010. «Typical of this was Gulp by a young Cardiff writer, Roger Williams: It was generally considered to be Cardiff's first professionally produced young, out gay play, referred to by the press as a 'cultural milestone'. ...»