Arg Cymraeg gwreiddiol Aberystwyth:Gwasg Aberystwyth, 1956 = Original Welsh ed Aberystwyth:Gwasg Aberystwyth,1956.
Return to Lleifior by Islwyn Ffowc Elis. ISBN 1859026443. Published by Gwasg Gomer in 1999. Publication and catalogue information, links to buy online and reader comments.