APA (7th ed.) Citation

Barker, J. W. (1966). Justinian and the later Roman Empire.

Chicago Style (17th ed.) Citation

Barker, John Walton. Justinian and the Later Roman Empire. 1966.

MLA (9th ed.) Citation

Barker, John Walton. Justinian and the Later Roman Empire. 1966.

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