1 2 Foster (editor), R F; Donnchadh O Corrain, Professor of Irish History at University College Cork: Prehistoric and Early Christian Ireland (ngày 1 tháng 11 năm 2001). The Oxford History of Ireland. Oxford University Press. ISBN0-19-280202-X.
↑ Mặc dù có một số nỗ lực trong quá khứ để xếp hạng ngôn ngữ Pict với ngôn ngữ phi Celt, quan điểm hàn lâm hiện nay là nó thuộc nhóm Briton. Xem: Forsyth (1997) tr37: "[T]he only acceptable conclusion is that, from the time of our earliest historical sources, there was only one language spoken in Pictland, the most northerly reflex of Brittonic."
↑ John E Pattison. Is it necessary to assume an apartheid-like social structure in early Anglo-Saxon England? Proceedings of the Royal Society B, 275(1650), 2423-2429, 2008 doi:10.1098/rspb.2008.0352
↑ Crummy, Philip (1997) City of Victory; the story of Colchester - Britain's first Roman town. Published by Colchester Archaeological Trust (ISBN 1 897719 04 3)
