| A trinity of martyrs : Terence MacSwiney, Cathal Brugha, Austin Stack | O'Kelly, John Joseph | Monograph or Collective Volume | Irish Book Bureau | 1947 |
| Cathal Brugha | O'Farrell, Fergus | Monograph or Collective Volume | University College Dublin Press | 2018 |
| Cathal Brugha | Ua Ceallaigh, Seán | Monograph or Collective Volume | Mac an Ghoill | 1942 |
| Cathal Brugha - as I knew him | O'Kelly, John Joseph | Article in Journal | | 1922 |
| Cathal Brugha : 'an indomitable spirit' | Ó Corráin, DaithI ; Hanley, Gerard | Monograph or Collective Volume | Four Courts Press | 2022 |
| Cathal Brugha : a shaol is a thréithe | Ó Dochartaigh, Tomás | Monograph or Collective Volume | Foilseachain Naisiunta Teo | 1969 |
| Cathal Brugha agus Conradh na Gaeilge | Ó Cionnfhaolaidh, Dónal | Article in Journal | | 2002 |
| Cathal Brugha, 1874-1922 | Ó Cillín, Micheál | Article in Journal | | 1984 |
| Deaths of Irish Patriots: Brugha, Griffith, Collins | Connell, Joseph E.A., jR | Article in Journal | | 2022 |
| History's daughter : a memoir of the only child of Terence MacSwiney | Brugha, Máire MacSwiney, 1918- | Monograph or Collective Volume | O'Brien Press | 2005 |
| Kathleen Kingston | | Article in Journal | | 2016 |
| Remembering Cathal Brugha | Curry, James | Article in Book | Dublin City Council | 2022 |
| Tea, Sandbags and Cathal Brugha: Kathy Barry's Civil Wars | Morrison, Eve | Article in Book | | 2021 |