APA (7th ed.) Citation

Norwich, J. J. (1988). Byzantium: The early centuries. Penguin Books.

Chicago Style (17th ed.) Citation

Norwich, John Julius. Byzantium: The Early Centuries. London: Penguin Books, 1988.

MLA (8th ed.) Citation

Norwich, John Julius. Byzantium: The Early Centuries. Penguin Books, 1988.

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