| Irish Recruitment to the British Armed Forces, 1914-1918 | Butler, WilliamMichael, TimothyWheatley, Michael | Monograph or Collective Volume | Liverpool University Press|sometimes given as Oxford University Press | 2020 |
| Oliver Cromwell in Ireland | Butler, William, Sir | Article in Book | | 1903 |
| The cathedral church of the Holy Trinity Dublin (Christ Church) : a description of its fabric, and a brief history of the foundation, and subsequent changes | Butler, William, Sir | Monograph or Collective Volume | Elliot Stock | 1901 |
| The century of sport | Butler, William | Article in Book | | 2001 |
| The disparity of sacrifice : Irish recruitment in the British Armed Forces, 1914-1918 | Bowman, Timothy ; Butler, William ; Wheatley, Michael | Monograph or Collective Volume | Liverpool University Press | 2020 |
| The formation of the Ulster Home Guard | Butler, William | Article in Journal | | 2016 |
| The Irish amateur military tradition in the British Army, 1854-1992 | Butler, William | Monograph or Collective Volume | Manchester UP | 2016 |
| The Irish amateur military tradition in the British Army, c.1854-1945 | Butler, William Marsh | Thesis | | |