See also the home page of the Texts and Translations book series MHRA Library of Medieval Welsh Literature

Early Welsh Gnomic and Nature Poetry
Edited by Nicolas Jacobs1 March 2012
A Selection of Early Welsh Saga Poems
Edited by Jenny Rowland1 September 2014
Historical Texts from Medieval Wales
Edited by Patricia Williams29 October 2012
Hystoria Gweryddon yr Almaen: The Middle Welsh Life of St Ursula and the 11,000 Virgins
Edited by Jane Cartwright20 July 2020
Delw y Byd: A Medieval Welsh Encyclopedia
Edited by Natalia I. Petrovskaia 31 December 2020