- Roundhead: English Civil War, Charles I of England, Divine Right of Kings, Oliver Cromwell, Edward Montagu, 2nd Earl of Manchester, Puritan, Presbyterianism, Independent (religion)
- The diaries of Oliver Cromwell Morris by Oliver Cromwell Morris, 1991
- CROMWELL, OLIVER (15991658): An entry from Charles Scribner's Sons' <i>Europe, 1450 to 1789: An Encyclopedia of the Early Modern World</i> by IAN GENTLES, 2004
- HARRINGTON, JAMES (16111677): An entry from Charles Scribner's Sons' <i>Europe, 1450 to 1789: An Encyclopedia of the Early Modern World</i> by RACHEL HAMMERSLEY, 2004
- OLIVER CROMWELL: SOLDIER: The Military Life of a Revolutionary at War by Alan Marshall, 2004-08
- Cromwell's Army: A History of the English Soldier During the Civil Wars, the Commonwealth and the Protectorate by C. H. Firth, 1992-06
- The Cromwellian Gazetteer: An Illustrated Guide to Britain in the Civil War and Commonwealth (Sutton History Paperbacks) by Peter Gaunt, 1998-01
- The Civil War: A Concise History and Picture Sourcebook by John Grafton, 2003
- Cromwell: An Honourable Enemy by Tom Reilly, 2008-09-12
- Cromwell and the New Model Foreign Policy by Charles P. Korr, 1974-01
- Oliver Cromwell and the rule of the Puritans in England (The World's classics) by C. H Firth, 1961
- Cromwell: Our Chief of Men by Antonia Fraser, 1997-01
- Winter Fruit: English Drama, 1642-1660 by Dale B.J. Randall, 1995-11-09
- CONSTITUTIONALISM: An entry from Charles Scribner's Sons' <i>Europe, 1450 to 1789: An Encyclopedia of the Early Modern World</i> by J. H. M. SALMON, 2004
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