Roller, Duane W. (2006). "Roman Exploration". Through the Pillars of Herakles: Greco-Roman Exploration of the Atlantic. Taylor and Francis. p. 119. ISBN978-0-415-37287-9.
Mossman, Theodor (1908). History of Rome. New York: Charles Scribner's SOns. p. 71. Archived from the original on 2009-09-01. Retrieved 9 October 2009.
Mossman, Theodor (1908). History of Rome. New York: Charles Scribner's SOns. p. 71. Archived from the original on 2009-09-01. Retrieved 9 October 2009.
Caesar. In: Hans Herzfeld [de] (1960): Geschichte in Gestalten (History in figures), vol. 1: A-E. Das Fischer Lexikon [de] 37, Frankfurt 1963, p. 214. "Hauptquellen [betreffend Caesar]: Caesars eigene, wenn auch leicht tendenziöse Darstellungen des Gallischen und des Bürgerkrieges, die Musterbeispiele sachgemäßer Berichterstattung und stilistischer Klarheit sind" ("Main sources [regarding Caesar]: Caesar's own, even though slightly tendentious depictions of the Gallic and the Civil Wars, which are paradigms of pertinent information and stylistic clarity")