APA (7th ed.) Citation

Comnena, A., Sewter, E. R. A., & Frankopan, P. (2009). The Alexiad. Penguin.

Chicago Style (17th ed.) Citation

Comnena, Anna, E. R. A. Sewter, and Peter Frankopan. The Alexiad. London ; New York: Penguin, 2009.

MLA (9th ed.) Citation

Comnena, Anna, et al. The Alexiad. Penguin, 2009.