David Berry, Wales and Cinema: the first hundred years (Caerdydd: Gwasg Prifysgol Cymru, 1994)

ap Dyfrig, R., Jones, E H G, Jones, G. The Welsh Language in the Media (Aberystwyth: Mercator Media, Mercator Media Monographs, 2006)

Variety, 28 Tachwedd 1985.

Listener, cyfrol 114, rhif 2934, 7 Tachwedd 1985.

Listener, cyfrol 114, rhif 2932, 24 Hydref 1985.

Television Today, 11 Ebrill 1985.

Hollywood Reporter, cyfrol 286, rhif 11, Mawrth 1985.