_Cambridge Medieval History_, vol. i, chs. i–iii, vii, viii, with
exhaustive bibliography; Gibbon, _Decline and Fall_, ed. Bury, chs.
xiii–xxvii; Niese, _Geschichte_, pp. 376–402; Schiller, _Röm. Kaiserzeit_,
vol. ii; Seeck, O., _Geschichte des Untergangs der antiken Welt_; Stuart
Jones, _Roman Empire_, chs. x–xi. Special: Geffcken, J., _Kaiser Julian_.