| A People's Progress - how independent Ireland delivered on the promise of her people's well-being | Henry, Mark | Article in Journal | | 2022 |
| O'Neills in the dossiers of the personnel section of the General Military Archive of Segovia | Henry, Mark | Article in Journal | | 2013 |
| The families of Annaghgad townland in the parish of Creggan | Henry, Mark | Article in Journal | | 2011 |
| The O'Neills of the Fews : their origin, descendants and DNA profile : II | Henry, Mark | Article in Journal | | 2016 |
| The O'Neills of the Fews : their origins, descendants and dna profile : I | Henry, Mark | Article in Journal | | 2015 |
| The O'Neills of the Fews: new findings concerning the historical O'Neill family and their present day lineage | Henry, Mark | Article in Journal | | 2013 |