Diodorus Siculus XXV: The king of the Orissi/Oretani, however, came to the aid of the beleaguered city, and by a feigned offer of friendship and alliance succeeded in routing Hamilcar. In the course of his flight Hamilcar contrived to save the lives of his sons and his friends by turning aside on another road; overtaken by the king, he plunged on horseback into a large river and perished in the flood under his steed, but his sons Hannibal and Hasdrubal made their way safely to Acra Leucê.
Strabo, geography 3.3.2: Of those who dwell above the aforesaid mountains, the Oretani are the most southern, extending in part as far as the sea-coast on this side the Pillars. Next these towards the north are the Carpetani, then the Vettones and Vaccæi, through whose [country] the Douro flows as it passes Acontia, a city of the Vaccæi. The Gallicians are the last, and inhabit for the most part a mountainous country: on this account they were the most difficult to subdue, and furnished his surname to the conqueror of the Lusitanians; in fact, at the present day the greater part of the Lusitanians are beginning to call themselves Gallicians. The finest cities of Oretania are Castulo and Oria.
For the other infos, it should come maybe from Cornelius Nepos and Appian, Iberike. But they are hard to find in english online. Moreover the st*pid guy that wrote the wikipedia page didn't put the original references.
Edit: like always, the Roman historiography is full of legends, moral judgments and distortions of the truth for political reasons. It is hard to know which version of the Oretani's king is true.