| Irish libraries : archives, museums and genealogical centres | O'neill, Robert Keating | Monograph or Collective Volume | Ulster Historical Foundation | 2007 |
| Irish libraries : archives, museums and genealogical centres : a visitor's guide | O'Neill, Robert Keating | Monograph or Collective Volume | Ulster Historical Foundation | 2002 |
| Letters from Robert Eugene O'Neill | O'Neill, Robert | Article in Journal | | 1964 |
| The Fenians | Mock, S.,O'Neill, Robert Keating | Article in Journal | | 2005 |
| The Irish book in the United States: an overview | O'Neill, Robert Keating | Article in Book | | 2011 |
| The temperance movement, prohibition and scarcity in Ontario, 1900-1916 | O'Neill, Robert | Monograph or Collective Volume | University of Toronto Press | 1984 |
| Ulster libraries : archives museums & ancestral heritage centres | O'Neill, Robert Keating | Monograph or Collective Volume | Ulster Historical Foundation | 1997 |