Dio Cassius
- Brief biography of Cassius Dio Coccetanus from the 1911 Encyclopedia Britannica.
- http://www.1911encyclopedia.org/Dio_Cassius

Lacus Curtius: Cassius Dio's Roman History
- Full text by chapter of the 1914 English translation by Earnest Cary.
- http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/

Dio Cassius (c. A.D. 40 - 110) - Cassius Dio Cocceianus
- PDF and hypertext selections from the 1914 Cary/Loeb translation of the Roman History.
- http://www.brainfly.net/html/dio_cass.htm

Cassius Dio and Ulpian
- Article by Robert L. Cleve in Ancient History Bulletin on the contrasting accounts of the regency during the reign of Severus Alexander.
- http://www.severusalexander.com/cleve.htm