[]For a listing of sources that treat Severus" origin and his rise to power, see T.D. Barnes, New Empire of Diocletian and Constantine, (Cambridge, 1982), 38, and A.H.M. Jones, J.R. Martindale, and J. Morris, the Prosopography of the Later Roman Empire, [Cambridge, 1971], s.v. "Fl. Val Severus 30," 1.837
[]Severus' attested movements and the sources that treat them are listed by Barnes, New Empire, 234ff., and Dietmar Kienast, Römische Kaisertabelle: Grundzüge einer römischen Kaiserchronologie, (Darmstadt, 1990), 286ff.
[]Severus' campaign against Maxentius is discussed by Barnes, Constantine and Eusebius,, (Cambridge, 1981), 30ff, E. Groag, RE 14, s.v. "Maxentius," col. 2426.6ff, and by W. Ensslin, RE 14, s.v. "Maximianus (1)," col. 2525.30ff.