- Alain Gowing, "Dio's Name". Classical Philology,Vol. 85, No. 1 (Jan., 1990), pp. 49–54. JSTOR link.
- Millar, Fergus (1964). Study of Cassius Dio. Oxford University Press. p. 250. ISBN 0-19-814336-2.
- Peck, Harry Thurston (1897). Harper's Dictionary of Classical Literature and Antiquities. Harper & Brothers. p. 1687. ASIN B000K28KCI.
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