Jelaskan Sumber primer dari Oliver Cromwell

Abbott, W.C. (ed.) (1937–1947). Writings and Speeches of Oliver Cromwell, 4 vols. The standard academic reference for Cromwell's own words. Questia.com.

Carlyle, Thomas (ed.) (1904 edition), Oliver Cromwell's letters and speeches, with elucidations.  ;

Haykin, Michael A. G. (ed.) (1999). To Honour God: The Spirituality of Oliver Cromwell Joshua Press, . Excerpts from Cromwell's religious writings.

Morrill, John, et al. (eds.). Writings and Speeches of Oliver Cromwell: A New Critical Edition, 5 vols. (projected). A new edition of Cromwell's writings, currently in progress. ()