| Anglo-Norman settlement in County Wexford | Colfer, Billy | Article in Book | | 1987 |
| Arrogant trespass : Anglo-Norman Wexford 1169-1400 | Colfer, Billy | Monograph or Collective Volume | Duffry Press | 2002 |
| In search of the barricade and ditch of Ballyconnor, Co. Wexford | Colfer, Billy | Article in Journal | | 1996 |
| Medieval boom and bust. The rise and fall of Bannow and Clonmines | Colfer, Billy | Article in Journal | | 2010 |
| Medieval Enniscorthy : urban origins | Colfer, Billy | Article in Book | | 2010 |
| Medieval Wexford | Colfer, Billy | Article in Journal | | 1990 |
| Monastery and manor : William Marshal's settlement strategy in Co. Wexford | Colfer, Billy | Article in Book | | 2017 |
| The Anglo-Norman colonisation of Wexford | Colfer, BillyColfer, Niall | Article in Book | | 2019 |
| The Cistercians in Wexford | Colfer, Billy | Article in Book | | 2007 |
| The county of Wexford | Colfer, Billy | Monograph or Collective Volume | Foillsitheoirí Cois Sláine | 1982 |
| The development of the church in the Diocese of Ferns in the twelfth and thirteenth centuries | Colfer, Billy | Article in Book | | 1999 |
| The ethnic mix in medieval Wexford | Colfer, Billy | Article in Journal | | 2002 |
| The Hook Peninsula, county Wexford | Colfer, Billy | Monograph or Collective Volume | Cork University Press | 2004 |
| The Hook, County Wexford | Colfer, Billy | Article in Book | | 1997 |
| The promontory of Hook | Colfer, Billy | Monograph or Collective Volume | [s.n.] | 1978 |
| The Redmonds of the Hall | Colfer, Billy | Article in Book | | 2007 |
| Tintern Abbey, county Wexford | Colfer, Billy | Article in Book | | 2003 |
| Wexford : a town and its landscape | Colfer, Billy | Monograph or Collective Volume | Cork University Press | 2008 |
| Wexford castles : landscape, context, settlement | Colfer, Billy | Monograph or Collective Volume | Cork University Press | 2013 |