| After disestablishment | Simms, George Otto | Article in Journal | | 1970 |
| Brendan the navigator : exploring the ancient world | Simms, George Otto | Monograph or Collective Volume | O'Brien Press | 1989 |
| Convention of Drumceatt, 575: XIVth centenary 1975 | Barbour, Liam M.Boyd, Hugh AlexanderClarke, WallaceClayden, Stanley C.Moore, R. DenholmMorton, T. RalphRoemmele, Peter M.Seymour, A. N.Simms, George OttoWalsh, John R. | Monograph or Collective Volume | | 1975 |
| Durrow's beauty | Simms, George Otto | Article in Journal | | 1979 |
| Early Christian manuscripts | Simms, George Otto | Article in Book | | 1986 |
| Exploring the Book of Kells | Simms, George Otto | Monograph or Collective Volume | O'Brien Press | 1988 |
| Faith in place : Roscrea and Kyle, a Church of Ireland parish history, by Adrian Hewson, including 'The Book of Dimma' by George O. Simms | Hewson, AdrianSimms, George Otto, archbishop of Armagh. | Monograph or Collective Volume | J. F. Walsh | 1990 |
| Irish illuminated manuscripts | Simms, George Otto | Monograph or Collective Volume | Eason | 1980 |
| Irish spirituality : some insights from the churches of the Reformation | Simms, George Otto | Article in Book | | 1981 |
| James Henthorn Todd | Simms, George Otto | Article in Journal | | 1969 |
| Leaves from the Book of Kells, the great gospel-book of Colm-cille | Simms, George Otto | Monograph or Collective Volume | [s.n.] | 1962 |
| Pioneers and partners : the story of the parish of All Saints' Grangegorman, Dublin, in the days of William Maturin (vicar 1843-1887) and Henry Hogan (curate-assistant 1861-1887: vicar 1887-1923) : a continuing tradition | Jenkins, Raymond G. FSimms, George Otto | Monograph or Collective Volume | Raymond G.F. Jenkins and George O. Simms | 1985 |
| St Patrick : the real story of Patrick who became Ireland's patron saint | Simms, George Otto | Monograph or Collective Volume | O'Brien Press | 1991 |
| The 1920s in Donegal | Simms, George Otto | Article in Book | | 1979 |
| The city of Armagh in the eighteenth century | Clarkson, L. A. (Leslie A.)Simms, George Otto | Article in Book | | 2001 |
| The founder of Armagh public library : Primate Robinson among his books | Simms, George Otto | Article in Journal | | 1971 |
| The founder of Armagh's public library : some sidelights on Primate Robinson, Baron Rokeby of Armagh | Simms, George Otto | Article in Journal | | 1972 |
| The psalms in the days of Saint Columba | Simms, George Otto | Monograph or Collective Volume | [s.n.] | 1963 |
| Tullow's story : a portrait of a county Dublin parish | Simms, George Otto | Monograph or Collective Volume | Select Vestry of Tullow Parish | 1983 |