APA (7th ed.) Citation

Firth, C. H. (1940). The regimental history of Cromwell's army. The Clarendon Press.

Chicago Style (17th ed.) Citation

Firth, Charles H. The Regimental History of Cromwell's Army. Oxford: The Clarendon Press, 1940.

MLA (9th ed.) Citation

Firth, Charles H. The Regimental History of Cromwell's Army. The Clarendon Press, 1940.