^Péter Kovács: Marcus Aurelius' Rain Miracle and the Marcomannic Wars (Mnemosyne Supplements 308), Brill Academic Publishers, Leiden 2009. ISBN 978-90-04-16639-4, p. 7.
^Adkins,Lesley Adkins,Roy A.(1998).Handbook to Life in Ancient Rome.Oxford University Press,USA.ISBN 9780195123326.