1. Bunyan, John. 1685. The Pilgrim’s Progress from this World, to That which is to come. Tenth Edition. London: Nathaniel Ponder. [digitales Exemplar verfügbar über Early English Books Online auf ProQuest, https://www.proquest.com/].
2. Bunyan, John. 1688. Taith neu Siwrnai y Pererin, tan Rîth neu Gyffelybiaeth Breuddwyd. London: J. Richardson. http://hdl.handle.net/10107/4787163. [digitales Exemplar auch verfügbar über Early English Books Online auf ProQuest, https://www.proquest.com/].
3. Bunyan, John. 1699. Taith y Pererin: Neu Siwrneu Dyn o’r Byd hwn ir Byd a ddaw. Shrewsbury: Thomas Jones. [digitales Exemplar verfügbar über Early English Books Online auf ProQuest, https://www.proquest.com/].
4. Conran, Tony. 1992. Welsh Verse. Bridgend: Seren Books.
5. Davies, Cennar. 1997. Early Free-Metre Poetry. In A Guide to Welsh Literature c. 1530–1700, Hrsg. R. Geraint Gruffydd, 75–99. Cardiff: University of Wales Press.