| Arthur Jacob (1790-1874) Laoisman who became internationally acclaimed eye surgeon pioneer | Fennelly, Teddy | Article in Journal | | 2010 |
| David and William Jacob - the last of the famous medical family in Portlaoise | Fennelly, Teddy | Article in Journal | | 2010 |
| John Jacob (1754-1827) - founder of the Queen's County Infirmary | Fennelly, Teddy | Article in Journal | | 2006 |
| The Dublin family of Jacob | Jacob, W. J. | Article in Journal | | 1940 |
| The ethos of W. & R. Jacob as employers & the diary of Charles Jacob | Jenkins, Michael | Article in Journal | | 2017 |
| The Jacob family in the Registry of Deeds, Dublin | Purcell, Margaret | Article in Journal | | 2005 |