| Henry Montgomery : ecclesiastic and politician | Allen, Robert | Article in Journal | | 1944 |
| Henry Montgomery, 1788-1865 | Allen, Robert | Article in Book | | 1949 |
| James Seaton Reid | Allen, Robert | Monograph or Collective Volume | | 1951 |
| On the road again with Arthur Young : English, Irish and French agriculture during the Industrial Revolution | Allen, Robert C.Ó Gráda, Cormac | Article in Journal | | 1988 |
| Scottish ecclesiastical influence upon Irish presbyterianism from the non-subscription controversy to the union of the synods | Allen, Robert, Rev. | Thesis | | 1940 |
| The Presbyterian College, Belfast, 1853-1953 | Allen, Robert | Monograph or Collective Volume | Mullen | 1954 |
| The principle of non-subscription to creeds and confessions of faith as exemplified in Irish presbyterian history | Allen, Robert, Rev. | Thesis | | 1944 |