^George C. Brauer (1975). 9780815550365, Noyes Press. ISBN 9780815550365 (revised Jan 2015)
^George C., Jr. BrauerThe Age of the Soldier Emperors : Imperial Rome, A.D. 244-284 by George C., Jr. Brauer (1975, Hardcover)ISBN 9780815550365 (revised Feb 2015)