Causes of the English Revolution, 1529-1642, Lawrence Stone: Routledge, 1986.
The Civil Wars of England, John Phillips Kenyon: Knopf, 1988.
The English Civil Wars, 1642-1660, Bob Carruthers: Cassell, 2000.
The World Turned Upside Down: Radical Ideas During the English Revolution, Christopher Hill: Viking Press, 1972.
See Chapter 10, “Ranters and Quakers”.