APA (7th ed.) Citation

Butterfield, H. (1948). Lord Acton. Historical Association.

Chicago Style (17th ed.) Citation

Butterfield, Herbert. Lord Acton. London: Historical Association, 1948.

MLA (9th ed.) Citation

Butterfield, Herbert. Lord Acton. Historical Association, 1948.

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