Gesammelte Schriften. Irland, Deutschland und die Freiheit der Meere und andere Aufsätze. Diessen vor München: Joseph Huber Verlag, 1916. Second expanded edition, 1917.
Some Poems. London: The Talbot Press/T. Fisher Unwin, 1918.
Roger Casement's speech from the dock, in Piaras F. Mac Lochlainn's Last words: letters and statements of the leaders executed after the rising at Easter 1916. Dublin: Stationery Office, 1990.
Works by this author published before January 1, 1931 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.