Jona Lendering of livius.org, who has an excellent and well illustrated page on Hannibal Barca, points to Appian's History of Rome: The War against Hannibal as a major source:
"Although only his books on the Roman Civil Wars survive in their entirety, large parts of other books have also come down to us. His account of the War against Hannibal contains some information that can not be found in other sources (Polybius of Megalopolis and Livy), is fortunately well-preserved, and is certainly accessible."
And he provides us with a translation, footnotes, and his own additions.
AR dishekel, 1½ & ¼, beardless male head, club behind / elephant
(Wikipedia/Carthage and its Coinage)
