Isaac, Graham R., Simon Rodway, Silva Nurmio, Kit Kapphahn, and Patrick Sims-Williams [eds.], Rhyddiaith Gymraeg o lawysgrifau’r 13eg ganrif: fersiwn 2, Aberystwyth: Aberystwyth University, Department of Welsh and Celtic Studies, 2013. Computer file.
Isaac, Graham R. [ed.], and Simon Rodway [ed.], Rhyddiaith Gymraeg o lawysgrifau’r 13eg ganrif: testun cyflawn, Aberystwyth: University of Wales Press, 2002. CD-ROM.
Transcriptions of Welsh-language texts from 13th-century Welsh manuscripts, transcribed by G. R. Isaac and Simon Rodway, with assistance from Ingo Mittendorf, Brynley F. Roberts and D. Mark Smith. New versions were published online in 2010 and 2013.
Wiliam, Aled Rhys, Llyfr Iorwerth: a critical text of the Venedotian code of medieval Welsh law, mainly from BM. Cotton MS. Titus D ii, History and Law Series, 18, Cardiff: University of Wales Press, 1960.
Evans, J. Gwenogvryn, Report on manuscripts in the Welsh language, vol. 2: The British Museum, Historical Manuscripts Commission, London, 1910.
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