| 1916. Overall plan : a concept of operations | Duggan, John P. | Article in Journal | | 1991 |
| A history of the Irish army | Duggan, John P. | Monograph or Collective Volume | | 1991 |
| A sentimental journey | Duggan, John P. | Article in Journal | | 2001 |
| German arms and the 1916 rising | Duggan, John P. | Article in Journal | | 1970 |
| Germany and Ireland in World War II | Duggan, John P. | Article in Journal | | 1993 |
| Herr Hempel at the German Legation in Dublin, 1937-1945 | Duggan, John P. | Monograph or Collective Volume | Irish Academic Press | 2003 |
| Memoirs of a wild goose | Bewley, CharlesDuggan, John P.McCormack, W. J. | Monograph or Collective Volume | Lilliput Press | 1989 |
| Neutral Ireland and the Third Reich | Duggan, John P. | Monograph or Collective Volume | Lilliput Press | 1989 |
| Neutral Ireland and the Third Reich | Duggan, John P. | Monograph or Collective Volume | Gill & Macmillan | 1985 |
| Poltergeist pistol | Duggan, John P. | Article in Journal | | 1995 |
| The German threat - myth or reality | Duggan, John P. | Article in Journal | | 1989 |
| The Irish Free State diplomatic service, 1922-1937 | Duggan, John P. | Monograph or Collective Volume | Irish Academic Press | 1994 |