Ryan, M. R., O'Brien, A. P., & Sinn Féin. Roger Casement Club. (1922). Letter from Rev. Micheál O'Riain from St. Joseph’s Presbytery, Sydney regarding Dr. Mannix and propagation of the anti-Treaty cause, with a statement issued by the Roger Casement Cumann of Sinn Féin (London) in memory of Erskine Childers.

Ryan, Michael Rev, et al. Letter from Rev. Micheál O'Riain from St. Joseph’s Presbytery, Sydney Regarding Dr. Mannix and Propagation of the Anti-Treaty Cause, with a Statement Issued by the Roger Casement Cumann of Sinn Féin (London) in Memory of Erskine Childers. 1922.