| "Ulster's midwife" : Sir Ernest Clark and the birth of the Northern Ireland administration | McColgan, John | Article in Journal | | 1990 |
| Boston in the Famine : city government and the emigrant crisis | McColgan, John | Article in Book | | 2022 |
| Boston's Donegal diaspora | McColgan, John | Article in Journal | | 2019 |
| British Cabinet Office Records and the Partition of the Irish Administration | McColgan, John | Article in Journal | | 1974 |
| British Policy and the Irish Administration, 1920-22 | McColgan, John | Monograph or Collective Volume | Allen & Unwin | 1983 |
| Implementing the 1921 Treaty : Lionel Curtis and Constitutional Procedure | McColgan, John | Article in Journal | | 1977 |
| Macallaí i Meiriceá : Scéal eirí amach na Cásca i nuachtáin na Stát Aontaithe | McColgan, JohnRowlands-Tarbox, Jean | Monograph or Collective Volume | Coiscéim | 2016 |
| Partition and the Irish administration, 1920-22 | McColgan, John | Article in Journal | | 1980 |
| The Irish administration in transition : British administrative policies in Ireland, 1920-1922 | McColgan, John J. | Thesis | | 1976 |