Ian Armit (1998). Scotland's Hidden History (Tempus [in association with Historic Scotland]) ISBN 0-7486-6067-4
Kenneth H. Jackson (1969). The Gododdin: The Oldest Scottish poem (Edinburgh: University Press)
Stuart Piggott (1982). Scotland Before History (Edinburgh: University Press) ISBN 0-85224-348-0
W.J. Watson (1926, 1986). The History of the Celtic Place-Names of Scotland: being the Rhind lectures on archaeology (expanded) delivered in 1916. (Edinburgh, London: W. Blackwood & Sons, 1926; Edinburgh: Birlinn, 1986, reprint edition). ISBN 1-874744-06-8