Birley, A. (1999). Septimius Severus: The African emperor. Routledge.
芝加哥风格引文Birley, Anthony. Septimius Severus: The African Emperor. London ; New York: Routledge, 1999.
MLA引文Birley, Anthony. Septimius Severus: The African Emperor. Routledge, 1999.
警告：这些引文格式不一定是100％准确.