APA (7th ed.) Citation

Birley, A. (1999). Septimius Severus: The African emperor. Routledge.

Chicago Style (17th ed.) Citation

Birley, Anthony. Septimius Severus: The African Emperor. London ; New York: Routledge, 1999.

MLA (9th ed.) Citation

Birley, Anthony. Septimius Severus: The African Emperor. Routledge, 1999.