I know the author is planning an update, but I wanted to point to the exceedingly helpful collection of annotated and explained resources by Dr. Carol Dana Lanahm: Using Medieval Latin: A Toolbox of Resources.
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Thomas Kinsella. Translator.The Tain: Translated from the Irish Epic Tain Bo Cuailnge.Oxford University Press. ISBN13: 9780192803733.
Barry Cunliffe. The Ancient Celts. OUP, 1997.