Coba jelasin Survei zamannya dari Oliver Cromwell dong

Coward, Barry (2002). The Cromwellian Protectorate Manchester University Press,

Coward, Barry and Peter Gaunt. (2017). The Stuart Age: England, 1603–1714, 5th edition, Longman, . Survey of political history of the era.

Davies, Godfrey (1959). The Early Stuarts, 1603–1660 Oxford University Press, . Political, religious, and diplomatic overview of the era.

Korr, Charles P. (1975). Cromwell and the New Model Foreign Policy: England's Policy toward France, 1649–1658 University of California Press,

Macinnes, Allan (2005). The British Revolution, 1629–1660 Palgrave Macmillan,

Morrill, John (1990). "Cromwell and his contemporaries". In Morrill, John (ed.), Oliver Cromwell and the English Revolution Longman,

Trevor-Roper, Hugh (1967). Oliver Cromwell and his Parliaments, in his Religion, the Reformation and Social Change Macmillan.

Venning, Timothy (1995). Cromwellian Foreign Policy Palgrave Macmillan,

Woolrych, Austin (1982). Commonwealth to Protectorate Clarendon Press,

Woolrych, Austin (2002). Britain in Revolution 1625–1660 Oxford University Press,