| Early Medieval defended settlement enclosures in Ireland in the 9th and 10th centuries AD | O’Sullivan, Aidan | Article in Book | | 2016 |
| Feldmarschall Browne, Irischer emigrant, kaiserlicher Heerführer, Gegenspieler Friedrichs II von Preussen | Duffy, Christopher | Monograph or Collective Volume | Herold | 1966 |
| The abbot and the monastic community in the Gaelic churches, 550 to 800 | Pettiau, Hérold | Article in Book | | 2006 |
| The Irish cashel : enclosed settlement, fortified settlement or settled fortification? With evidence from ongoing excavations at Caherconnell, Co. Clare, western Ireland | Comber, Michelle | Article in Book | | 2016 |
| The officials of the church of Armagh in the early and central middle ages, to A.D. 1200 | Pettiau, Hérold | Article in Book | | 2001 |