APA (7th ed.) Citation

Buchan, J. (1941). Oliver Cromwell / by John Buchan. Reprint Society.

Chicago Style (17th ed.) Citation

Buchan, John. Oliver Cromwell / by John Buchan. London: Reprint Society, 1941.

MLA (9th ed.) Citation

Buchan, John. Oliver Cromwell / by John Buchan. Reprint Society, 1941.

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