Cyfres Syniad Da: Moto Ni, Moto Coch - Canmlwyddiant Cwmni Bysus Clynnog a Threfor Jones, Geraint Heftet / 2012 / Walisisk
Cyfres Syniad Da: Bara o Ben Draw'r Byd - Stori Becws Islyn Becws o Ben Draw'r Byd Jones, Geraint Heftet / 2017 / Walisisk
Designing Correct Circuits Workshop jointly organised by the Universities of Oxford and Glasgow, 26–28 September 1990, Oxford Jones, Geraint Heftet / 1991 / Engelsk
