McCartan, P., O'Brien, A. P., & Irish Self-Determination League of Great Britain. (1921). Correspondence of Art Ó Briain with Patrick McCartan, Secretary of Committee of Enquiry regarding the World Conference of Irish Race, about the compiling and distribution of a report on the proceedings, with statement and two circulars of the Irish Self-Determination League regarding early preparations for the Conference.

McCartan, Patrick, et al. Correspondence of Art Ó Briain with Patrick McCartan, Secretary of Committee of Enquiry Regarding the World Conference of Irish Race, About the Compiling and Distribution of a Report on the Proceedings, with Statement and Two Circulars of the Irish Self-Determination League Regarding Early Preparations for the Conference. 1921.