| Clergy who served in Castlebridge | Gahan, John | Article in Book | | 2005 |
| George Barrington | McGahan, John | Article in Journal | | 1942 |
| Some Ferns missionaries of bygone days | Gahan, John | Article in Book | | 1999 |
| The diocesan clergy of Ferns : some reflections | Gahan, John | Article in Book | | 1999 |
| The secular priests of the diocese of Ferns : lists of priests who served in each parish, with short biographical notes | Gahan, John | Monograph or Collective Volume | Editions de Signe | 2000 |
| Up close and personal... evidence for impact damage on Irish halberds | Bright, PaulGahan, JohnGilchrist, Michael D.O'Flaherty, Ronan | Article in Journal | | 2008 |