| Charles Gavan Duffy, patriot and statesman : the story of Charles Gavan Duffy (1816-1903) | Ó Broin, León, 1902-1990 | Monograph or Collective Volume | J. Duffy | 1967 |
| Gallery of Irish writers : the Irish writers of the seventeenth century | McGee, Thomas D'Arcy, 1825-1868 | Monograph or Collective Volume | Lemma Publishing Corporation | 1974 |
| P.J. Duffy Drapery, Tullow | McQuinn, Christopher P.Murphy, John | Article in Journal | | 2020 |
| The Irish Volunteers, 1913-1915 : recollections and documents | Martin, F. X. (Francis Xavier), 1922-2000 | Monograph or Collective Volume | J. Duffy | 1963 |
| Three poems by W.J. Duffy. "The Lads from the heather", "Oh Glendalough", "Song" | Duffy, W.J. | Article in Journal | | 1996 |
| W.J. Duffy | O'Brien, Patrick | Article in Journal | | 1996 |
| William J. Duffy | P., N.J. | Article in Journal | | 1997 |