| 'Principle well seasoned with the sauce of realism' : Seán Lester, Joseph Walshe and the definition of the Irish Free State's policy towards Manchuria | Kennedy, Michael (Michael J.) | Article in Journal | | 1995 |
| Could this Irishman have stopped HItler? | McNamara, Paul | Article in Journal | | 2009 |
| De bhunadh protastúnach : nó rian Chonradh na Gaeilge | Ó Glaisne, Risteárd, 1927-2003 | Monograph or Collective Volume | Carbad | 2000 |
| Polish views of Seán Lester as high commissioner of the League of Nations in Danzig, 1934-1937 | McNamara, Paul Martin | Thesis | | 2007 |
| Sean Lester, Poland and the Nazi takeover of Danzig | McNamara, Paul | Monograph or Collective Volume | Irish Academic Press | 2009 |
| Seán Lester: Journalist, revolutionary, diplomat, statesman | Keown, Gerard | Article in Journal | | 2012 |
| The international civil servant : the League of Nations career of Seán Lester, 1929-46 | Barcroft, Stephen Ashworth | Thesis | | 1973 |
| The last secretary general : Sean Lester and the League of Nations | Gageby, Douglas | Monograph or Collective Volume | Townhouse | 1999 |