Cunliffe, Barry : The Ancient Celts , 1999. Penguin paperback. (London 1997) (Unntatt s. 68-90).
? Cróinín, Dáibhí: Early medieval Ireland, 1995. London: Longman. ISBN:?0-582-01565-0. kap. 1, 3, 8 og 9.
Kinsella, Thomas: The Táin: From the Irish Epic "Táin Bo Cuailinge" , 2002. Oxford Paperbacks . ISBN:?0192803735.
Foster, Sally M.: Picts, Gaels, and Scots: early historic Scotland, 1996. London: B. T. Batsford/Historic Scotland. ISBN:?0-7134-7485-8.
Kompendium 1
Rankin, D. : Celts and the classical world, 1987 (Paperback 1996). Routledge, London & N.Y.. kap. 4-6.
? Corráin, Donnchad (1989): Prehistoric and early Christian Ireland, in: Foster, R.F. (ed.): The Oxford illustrated history of Ireland, Oxford: Oxford University Press, p.1-52
Piggot, Stuart: The Druids, 1975 Praeger; 1985 Thames and Hudson. kap. 1-3.
Kompendium 2
Green, M. & R. Howell: Celtic Wales. A pocket guide , 2000. Cardiff: University of Wales Press . ISBN:? 0708315321. kap. 5-6.
Raftery, B.: Pagan Celtic Ireland: the enigma of the Irish Iron Age, 1994. London: Thames and Hudson . ISBN:?0-500-05072-4, 0-500-27983-7 . kap. 4-8.
Thomas, C.: Britain and Ireland in early Christian times: AD 400-800, 1971. Library of medieval civilization, London: Thames and Hudson. kap. 2.
Kompendium: Fastlandskeltisk og ?ykeltisk
Quiggin, E.C.: Celt, in: Encyclopaedia Britannica, 1910, s.611-652
Kursorisk lesing
Dillon, Myles & Nora K. Chadwick: The Celtic Realms, 1967; 2000. London : Weidenfeld and Nicolson; Phoenix Press paperback . kap. 2-4 og 6-9; kart 1-6.
Breeze, A.: Medieval Welsh Literature , 1997 . Dublin: Four Courts Press. s 7-27.