Alison Smith, John Petts and the Caseg Press (Aldershot: Ashgate, 2000).
'John Petts: Designer-Craftsman 1914-1991' in The Journal of Stained Glass, vol. XIX, no. II, pp. 216-236 (1991).
Alison Smith, 'Light, Colour and the Bible: The Stained Glass Windows of John Petts (1914-91)' in Biblical Art from Wales, pp. 217-233 (Sheffield: Sheffield Phoenix Press, 2010).
Maurice Broady, 'Stained Glass Design in Wales' in Transactions of the Honourable Society of Cymmrodorion, vol. 6 (new series) (2000), 159-60.
from East Window
Church of St Ystyffan, Llansteffan, Carmarthenshire
east wall of the chancel