» Cromwell 400 An introduction to Oliver Cromwell, (1599-1658), his life and significance, highlighting organisations and events commemorating the 400th anniversary of his birth. http://www.lib.cam.ac.uk/exhibitions/Cromwell/
» Eduard Bernstein: Cromwell and Communism (1895) Socialism And Democracy in the Great English Revolution. Online book. http://www.marxists.org/reference/archive/bernstein/works/1895/cromwell/index.htm
» Oliver Cromwell Biography of Cromwell courtesy of the BBC. http://www.bbc.co.uk/history/british/civil_war_revolution/cromwell_01.shtml
» The British 17th Century Civil Wars Commentary, biographies, chronology of the wars and related links. http://freespace.virgin.net/owston.tj/civilwar.htm
» The Cromwell Association Study of Cromwell and the wider history of the period, which includes the Civil War, the Commonwealth and the Protectorate. http://www.olivercromwell.org/
» The Cromwellian Conquest of Ireland Full text of article on Cromwell's Irish campaign by Basil P. Briguglio, Jr. . http://historynet.com/mh/blcromwellianconquest/
» The Era of Cromwell And The Commonwealth The full text from The History of the Christian Church by Henry C. Sheldon, 1895. http://www.edwardtbabinski.us/sheldon/commonwealth.html