| A contribution to a study of Fenianism in Breifne | Ó Lúing, Seán | Article in Journal | | 1967 |
| Breffny in the nine years' war | Butler, James | Article in Journal | | 1943 |
| Breifne and its chieftains | O'Connell, Philip | Article in Book | | 1950 |
| Breifne: an early history of the Ua Ruairc dynasty | Moore, Owen Joseph (Ó Mórgha, Eoghan) | Thesis | | 1998 |
| Some aspects of the literary tradition of the Breifne - Fermanagh area | Ó Mórdha, Séamus | Article in Journal | | 1983 |
| The last harpers - and Breifne | Ó Caithnia, Liam P. | Article in Journal | | 1980 |
| The O'Reillys of east Breifne and the problem of "Surrender and Regrant" | Brady, Ciarán, 1952- | Article in Journal | | 1985 |
| The praises of Breifne | Uí Ógáin, Ríonach | Article in Journal | | 1986 |
| The prehistory of the Breifne region | Barron, Thomas J. | Article in Journal | | 1958 |
| The schools and scholars of Breiffne | Corcoran, Timothy Joseph, 1872-1943Lyons, P.O'Connell, Philip | Monograph or Collective Volume | Browne and Nolan | 1942 |