Cyhoeddwyd gan Y Ganolfan Astudiaethau Addysg, Aberystwyth mewn partneriaeth รข Choleg y Drindod, Caerfyrddin = Published by Y Ganolfan Astudiaethau Addysg, Aberywtwyth in partnership with Trinity College, Carmarthen.
Cwlwm by Eirlys Roberts. ISBN 1856449610. Published by Y Ganolfan Astudiaethau Addysg in 1996. Publication and catalogue information, links to buy online and reader comments.