Charles Harding Firth

• Oliver Cromwell and the Rule of the Puritans in England
• Scotland and the Commonwealth
• Scotland and the Protectorate
• The Letters And Speeches Of Oliver Cromwell, Volume 2
• The Letters And Speeches Of Oliver Cromwell, Volume 3
• The life of William Cavendish, duke of Newcastle
• The Memoirs of Edmund Ludlow, Lieutenant-General of the Horse in the Army of the Commonwealth of England, 1625-1672; Volume 1
• The Memoirs of Edmund Ludlow, Lieutenant-General of the Horse in the Army of the Commonwealth of England, 1625-1672; Volume 2
• The Parallel between the English and American Civil Wars
• Cromwell's Army
• Last Years of the Protectorate 1656-1658
• Letters and Speeches of Oliver Cromwell with Elucidations, of III; Volume I