| A curious episode in the family affairs of the Geoghegans of Castletown-Geoghegan | Clare, Wallace | Article in Journal | | 1962 |
| An address to a student of law | Ní Dhonnchadha, Máirín | Article in Book | | 1989 |
| Gaelic legal professionals and political change in Galway and North Clare, c.1560-c.1630 | Cunningham, Bernadette | Article in Journal | | 2021 |
| Geinealaigh Clainne Aodhagáin, A.D. 1400-1500 : ollamhain i bhféineachus is i bhfilidheacht | Ní Mhaol-Chróin, Caitlín | Article in Book | | 1944 |
| History of the Clan Egan : the birds of the forest of wisdom | Egan, Joseph J.Egan, Mary Joan | Monograph or Collective Volume | UMI, Monographs for the Irish American Cultural Institute | 1979 |
| Keeping it in the family: the collective effort of the men and women in county Wexford in Easter 1916 | Doran, Gráinne | Article in Journal | | 2016 |
| Letter to Mary - Tyrell and Donegan families of Co. Offaly | Fearon, Karys | Article in Journal | | 2012 |
| Mícheál Ó Cléirigh and the Mac Aodhagáin school of law and history in Ormond | Cunningham, Bernadette | Article in Book | | 2007 |
| P. & H. Egan Limited, Bridge House, Tullamore in the 1960s, | Byrne, Michael | Article in Book | Offaly Historical and Archaeological Society (Offaly History) | 2024 |
| Reshaping the Egan tree | Wearing, Joseph
| Article in Journal | | 2019 |
| Testimony : the Book of the O’Davorens at Galway City Museum | Dillon, Gavin | Article in Journal | | 2019 |
| The ancient law school of Park, Co. Galway | Costello, T. B. | Article in Journal | | 1940 |
| The Egan Irish harps : tradition, patrons and players | Hurrell, Nancy | Monograph or Collective Volume | Four Courts Press | 2019 |
| The Egans of Curraghboy : their direct descendents and family connections | Egan, Edward | Monograph or Collective Volume | Edward Egan | 2009 |
| The Geoghegans of Ballinteer Villa | Smyth, Honor | Article in Journal | | 1999 |
| The MacEgan family | MacEgan, Marie | Article in Journal | | 1939 |
| The Mageoghans | Cox, Liam, 1908-2003 | Article in Journal | | 1969 |
| The Mageoghegans | Walsh, Paul, Revd, 1885-1941 | Monograph or Collective Volume | Westmeath Examiner | 1938 |
| The McKeegans of Glenaan | Murphy, Timothy J. | Article in Journal | | 2007 |
| The O'Regans of Carbery | Collins, John T. | Article in Journal | | 1958 |
| The Regan clan | McGovern (née Regan), Hannah | Article in Journal | | 2006 |
| The Yank from Mourne Abbey. Part 4 | Byrne, Niall J. | Article in Journal | | 2006 |
| Tuam and Bermingham heraldic connections in Clonbern | Bellew, Seamus | Article in Journal | | 2014 |
| Two Irish Brehon scripts : with notes on the MacEgan family | Blake, Martin J. | Article in Journal | | 1909 |
| Under the spreading Egan tree | Wearing, Joseph | Article in Journal | | 2010 |