| 'A man of great power for a long time' : Tigernán Ua Ruairc and the Book of Kells | Casey, Denis | Article in Journal | | 2010 |
| 'Mulmorie Oge O'Reylie, gent.' alias Maol Mórdha Óg Uí Raighaillaigh of Bellanacargy | Moore, Eoghan | Article in Journal | | 2015 |
| 'Prudentia et Fortitudine' in the Tudor period. The O'Reillys: an analysis of annalistic evidence (1100-1600 A.D.) | O'Reilly, Patrick J. | Article in Journal | | 2015 |
| 'Surrender and regrant mark II': the indenture between Brian O'Rourke, chief of west Breifne and Sir Nicholas Malby (1577) | Maginn, Christopher | Article in Journal | | 2006 |
| 'This publick injustice': a Jacobite paper concerning the Restoration land settlement | Griffin, Stephen | Article in Journal | | 2023 |
| A contribution to a study of Fenianism in Breifne | Ó Lúing, Seán | Article in Journal | | 1967 |
| Annála as Breifne | | Article in Journal | | 1970 |
| Breffny in the nine years' war | Butler, James | Article in Journal | | 1943 |
| Breifne : from chieftain to landlord | Weir, Mary | Monograph or Collective Volume | Nonsuch | 2009 |
| Breifne and its chieftains | O'Connell, Philip | Article in Book | | 1950 |
| Bréifne bias in Cogad Gáedel re Gallaib | Ní Mhaonaigh, Máire | Article in Journal | | 1992 |
| Breifne in nineteenth-century Ontario | Murphy, Pat | Article in Journal | | 2007 |
| Breifne: an early history of the Ua Ruairc dynasty | Moore, Owen Joseph (Ó Mórgha, Eoghan) | Thesis | | 1998 |
| Culture and society in early modern Breifne ~ Cavan | | Monograph or Collective Volume | Four Courts | 2009 |
| Derbforgaill: twelfth-century abductee, patron and wife | Ó Hoireabhárd, Seán | Article in Journal | | 2022 |
| Early medieval hand-bells from Breifne | Bourke, Cormac | Article in Journal | | 2018 |
| Early regional identity and local prehistoric community in the Cavan area | Cody, Eamon | Article in Journal | | 2012 |
| Le money del Oraylly (O'Reilly's money) | Dolley, MichaelSeaby, W. A. | Article in Journal | | 1967 |
| O Ruairc of Breifne | MacDermot, Betty | Monograph or Collective Volume | Drumlin | 1990 |
| O'Rourke strongholds of west Breifne and some other chieftaincies : photographs with historic notes and maps | Anonymous | Monograph or Collective Volume | [s.n.] | 1993 |
| One of his own: the Irish participant in the assassination of Tigernán Ua Ruairc | Ó Hoireabhárd, Seán | Article in Journal | | 2018 |
| Sanctity and politics in Connacht c.1100 : the case of St Fursa | Ó Riain, Pádraig | Article in Journal | | 1989 |
| Some aspects of the literary tradition of the Breifne - Fermanagh area | Ó Mórdha, Séamus | Article in Journal | | 1983 |
| Some Irish MSS with Breifne associations | De Brún, Pádraig | Article in Journal | | 1969 |
| Succession in twelfth-century Bréifne | Ó Hoireabhárd, Seán | Article in Journal | | 2023 |
| The assassination of Tigernán Ua Ruairc, the last king of Meath | Ó Hoireabhárd, Seán | Article in Journal | | 2018 |
| The Books of Knockninny : manuscripts, culture and society in early eighteenth-century Fermanagh | | Monograph or Collective Volume | Cumann Seanchais Bhréifne | 2019 |
| The end of the O'Reilly lordship, 1584-1610 | Brady, Ciarán | Article in Book | | 2004 |
| The Gaelic lordship of west Bréifne : a strategic conundrum of the Elizabethan wars in Ireland | Kelly, Francis | Article in Book | | 2025 |
| The last harpers - and Breifne | Ó Caithnia, L. P. | Article in Journal | | 1980 |
| The limitations of Tudor reform: the policy of 'Surrender and regrant' and the O'Rourkes | Maginn, Christopher | Article in Journal | | 2007 |
| The O'Reillys of east Breifne and the problem of "Surrender and Regrant" | Brady, Ciaran F. | 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 |
| The Uí Briúin Bréifni genealogies and the origins of Bréifne | Ó Mórdha, Eoghan | Article in Journal | | 2002 |
| Two Breifne manuscripts | De Brún, Pádraig | Article in Journal | | 1972 |
| William Gorm de Lacy : 'chiefest champion in these parts of Europe' | Veach, Colin T.Verstraten Veach, Freya | Article in Book | | 2013 |