Sekundære kilder Southern, Patricia (2001): , Routledge. Syme, Ronald (1971): , Oxford University Press. Potter, David Stone (2004): , Routledge. Meckler, Michael L. (1997): «Maximinus Thrax (235-238 A.D.)» i: Canduci, Alexander (2010): , Pier 9, ISBN 978-1-74196-598-8.