"Clarendon Press Series, The Gospel of Saint Mark in Gothic, According to the Translation made by Wulfila in the Fourth Century. Edited with a grammatical introduction and glossarial index by the Rev. Walter W. Skeat, M.A., Elrington and Bosworth Professor of Anglo-Saxon in the University of Cambridge. Oxford: Clarenden Press, 1882."
Gothic was originally written with a Runic alphabet about which little is known. One theory of the origins of Runes is that they were invented by the Goths, but this is impossible to prove as very few inscriptions of writing in Gothic runes survive.
Known best as the northern tribes who raided the Roman territories, "[t]he Goths were divided into two main tribes: the Ostrogothi or Greutungi (dune-dwellers) and the Visigothi or Tervingi (steppe-dwellers). Related tribes included the Burgundians and the Vandals.
"The Gothic alphabet [of the now extinct language] was invented around middle the 4th century AD by Bishop Wulfila (311-383 AD), the religious leader of the Visigoths, to provide his people with a written language and a means of reading his translation of the Bible. It is based on the Greek alphabet, with some extra letters from the Latin and Runic alphabets. (Source : Omniglot.com )