APA (7th ed.) Citation

Stephenson, P. c. 2. J. (2009). Constantine: Unconquered emperor, Christian victor (1. publ. in Great Britain.). Quercus.

Chicago Style (17th ed.) Citation

Stephenson, Paul ca. 20./21. Jh. Constantine: Unconquered Emperor, Christian Victor. 1. publ. in Great Britain. London: Quercus, 2009.

MLA (9th ed.) Citation

Stephenson, Paul ca. 20./21. Jh. Constantine: Unconquered Emperor, Christian Victor. 1. publ. in Great Britain. Quercus, 2009.