An important source of knowledge of the Goths is Getica, a semi-fictional account, written in the 6th century by the Roman historian Jordanes, of their migration from southern Scandza (Scandinavia), into Gothiscandza-believed to be the lower Vistula region in modern Pomerania-and from there to the coast of the Black Sea.
The Goths by Henry Bradley is a fascinating history of the people that brought down the Romans.