| 100 years of tradition | Greene, Rita | Article in Journal | | 2011 |
| Bantry, Berehaven and the O'Sullivan sept. | Sullivan, Timothy Daniel | Monograph or Collective Volume | Tower Books | 1978 |
| Irish-American geography of Catholics surnamed O'Sullivan | O'Sullivan, Patrick | Article in Journal | | 1988 |
| No. 36 Parliament Street, Kilkenny | Brennan, Seamus | Article in Journal | | 2013 |
| Phoenix Paradiso | O'Connor, John | Article in Journal | | 2019 |
| Pioneer Irish families in Virginia, the Meades and Sullivans | O'Brien, Michael J. | Article in Journal | | 1926 |
| The Eóganachts of Cashel in Kerry: The MacCarthys, the O'Sullivans, the O'Donoghues of the Glens | O'Donoghue, ElizabethO'Donoghue, Tighe, | Article in Journal | | 2014 |
| The Mac Fínín Duibh O'Sullivans of Tuosist and Bearehaven | Lyne, Gerard J. | Article in Journal | | 1976 |
| The O'Sullivans and the McCarthys | McCarthy, Paddy | Article in Journal | | 2010 |
| The origins of Count O'Sullivan, confidant of Leopold I, king of the Belgians and some other O'Sullivans in Belgium | Casteleyn, Mary | Article in Journal | | 2006 |
| The O’Sullivan sept | Murphy, Seán | Article in Journal | | 1995 |
| The Sullivans - a notable 19th century Kilkenny family | Smithwick, Peter | Article in Journal | | 1964 |