The Nuttall Encyclopedia
Journalist, and a Nationalist ex-M.P. for Cork; was twice over imprisoned for political offences; had to retire in 1895; b . 1852.
Wood, James, ed. Entry for 'O'brien, William'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/obrien-william.html. Frederick Warne & Co Ltd. London. 1900.