Birley, A. (1999). Septimius Severus: The African emperor. Routledge.
Chicago-čujuhus (17. p.)Birley, Anthony. Septimius Severus: The African Emperor. London ; New York: Routledge, 1999.
MLA-čujuhus (9. p.)Birley, Anthony. Septimius Severus: The African Emperor. Routledge, 1999.
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