APA (7th ed.) Citation

Harrison, F. (1923). Oliver Cromwell. Macmillan.

Chicago Style (17th ed.) Citation

Harrison, Frederic. Oliver Cromwell. London: Macmillan, 1923.

MLA (9th ed.) Citation

Harrison, Frederic. Oliver Cromwell. Macmillan, 1923.

Warning: These citations may not always be 100% accurate.