Coba jelasin Sumber dari Pescennius Niger dong

Cassius Dio, Roman History, Books 74 & 75

Herodian, Roman History, Books 2 & 3

Historia Augusta, Life of Pescennius Niger

Southern, Pat. The Roman Empire from Severus to Constantine, Routledge, 2001

Potter, David Stone, The Roman Empire at Bay, AD 180-395, Routledge, 2004

Bowman, Alan K., The Cambridge Ancient History: The Crisis of Empire, A.D. 193-337, Cambridge University Press, 2005

http://www.roman-emperors.org/pniger.htm Meckler, Michael L, "Pescennius Niger (193-194 A.D.)", De Imperatoribus Romanis] (1998)