O'Brien, A. P., De Valera, É., & Ó Ceallaigh, S. T. (1919). Correspondence of Art Ó Briain with Éamon de Valera, President of Dáil Éireann and with members of the Government of Saorstát Éireann with regard to his appointment as Envoy in London, together mainly with Seán T. Ó Ceallaigh with regard to Republican prisoners in Britain and the Gaelic League.

O'Brien, Art Patrick, et al. Correspondence of Art Ó Briain with Éamon De Valera, President of Dáil Éireann and with Members of the Government of Saorstát Éireann with Regard to His Appointment as Envoy in London, Together Mainly with Seán T. Ó Ceallaigh with Regard to Republican Prisoners in Britain and the Gaelic League. 1919.