Hughes, K. A., & O'Brien, A. P. (1921). Correspondence of Art Ó Briain with Caitlín Ní Aodha (Katherine Hughes of Canada, secretariat for the World Conference of the Irish Race) relating to requests for information on individuals and preparations for the conference, with a report by her on the conference.

Hughes, Katherine Angelina, and Art Patrick O'Brien. Correspondence of Art Ó Briain with Caitlín Ní Aodha (Katherine Hughes of Canada, Secretariat for the World Conference of the Irish Race) Relating to Requests for Information on Individuals and Preparations for the Conference, with a Report by Her on the Conference. 1921.