| 'Destruction by peace' : Hugh O'Neill after Kinsale | Walsh, M. K. | Monograph or Collective Volume | Amagh Historical Association | 1986 |
| O'Sullivan Beare in Spain : some unpublished documents | Walsh, M. K. | Article in Journal | | 1990 |
| The Hadsors and some other Louth exiles in France and Spain | Walsh, M. K. | Article in Journal | | 1976 |
| The last earls of Tyrone in Spain and Captain Bernardo O'Neill, illegitimate son of Eoghan Rua | Walsh, M. K. | Article in Journal | | 1988 |
| The military order of St Patrick, 1593 | Walsh, M. K. | Article in Journal | | 1979 |
| The will of John O'Neill, third earl of Tyrone | | Article in Journal | | 1974 |
| Unpublished letters of Hugh O'Neill, Glanconcadhaim, 1602 | Walsh, M. K. | Article in Journal | | 1981 |