| Commentary, Fr. Nicholas Callan : scientist and theologian | Farrell, Dermot | Article in Journal | | 1998 |
| Dr Callan family papers | McLaughlin, Patrick J. | Article in Journal | | 1969 |
| Dr. Callan of Maynooth | McLaughlin, P. J. | Article in Journal | | 1936 |
| Nicholas Callan - his work and times | Murphy, Patrick | Article in Journal | | 1964 |
| Nicholas Callan : priest scientist | McLaughlin, P. J. | Monograph or Collective Volume | Clonmore & Reynolds | 1965 |
| Nicholas Callan, 1799-1864 | McKeith, Niall E. | Article in Book | | 2003 |
| The 'prelections' of Nicholas Callan (1799-1864) | McLoughlin, Patrick J.I., Monsignor | Article in Journal | | 1964 |
| The Callan image | McLaughlin, P. J. | Article in Journal | | 1964 |
| The scientific apparatus of Nicholas Callan and other historic insturments | Mollan, R. C. (R. Charles)Upton, John | Monograph or Collective Volume | St Patrick's College|Samton | 1994 |