APA (7th ed.) Citation

Barraclough, G. (1950). The Mediaeval empire. Historical Association.

Chicago Style (17th ed.) Citation

Barraclough, Geoffrey. The Mediaeval Empire. London: Historical Association, 1950.

MLA (9th ed.) Citation

Barraclough, Geoffrey. The Mediaeval Empire. Historical Association, 1950.

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