| A guide to tracing your Donegal ancestors | Duffy, GodfreyMeehan, Helen | Monograph or Collective Volume | Flyleaf Press | 2014 |
| A guide to tracing your Donegal ancestors | Duffy, GodfreyMeehan, Helen, | Monograph or Collective Volume | Flyleaf Press | 2008 |
| Clonmahy parish | Duffy, Godfrey | Article in Journal | | 1993 |
| County Monaghan immigrants in the Consett area of County Durham, England, 1842-1855 | Duffy, Godfrey F. | Article in Journal | | 1997 |
| The Famine Irish in Newcastle & Co Durham : Sources for Genealogical Research | Duffy, Godfrey | Article in Journal | | 2001 |
| The origins of the Irish in Newcastle and County Durham | Duffy, Godfrey | Article in Journal | | 2002 |
| William Smith O'Brien. A plea for mercy from the people of Ireland | Duffy, Godfrey | Article in Journal | | 1994 |
| William Smith O’Brien : petitions of mercy | Duffy, Godfrey F. | Article in Journal | | 1995 |