Casgliad o waith Ieuan Deulwyn gan Ifor WilliamsIeuan Deulwyn, Williams, Ifor Sir · First published 1909Open the Tome
Pedeir Keinc Y Mabinogi Allan O Lyfr Gwyn RhydderchSir Ifor Williams · First published 1996Open the Tome
The beginnings of Welsh poetryWilliams, Ifor Sir · First published 1972 · Latest edition 1980Open the Tome
Lectures on Early Welsh Poetry (Welsh - Language & Literature)Sir Ifor Williams · First published 1970Open the Tome
