| Connolly Column : the story of the Irishmen who fought in the ranks of the International Brigades in the national revolutionary war of the Spanish people, 1936-39 | O'Riordan, Michael | Monograph or Collective Volume | New Books | 1979 |
| Connolly column : the story of the Irishmen who fought in the ranks of the International Brigades in the national-revolutionary war of the Spanish people, 1936-1939 | O'Riordan, Michael | Monograph or Collective Volume | Warren & Pell Publishing | 2005 |
| Contemporary Ireland and the religious question : a Catholic view | O'Riordan, Michael | Article in Book | | 1912 |
| Marx - the Irish connection | O'Riordan, Michael | Article in Journal | | 1983 |