正如人們所預料的那樣，對於這樣一個深受歡迎的主題，相關的書籍非常之多。在提出延伸閱讀的建議時，我必然要精挑細選，限定在每個大標題下不超過四本書。我選擇的都是用英文出版的作品，每一本都有長長的參考書目，如果一本一本地去閱讀，一定會讓你終身受益。我略去了所有那些依賴第三手資料來源而自己又沒什麽可補充的著作，無論它們有多麽吸引人。毋庸置疑，那些思想極端的著作概不收錄。
歐洲史前背景
B. Cunliffe (ed.), The Oxford Illustrated History of Prehistoric Europe (Oxford: Oxford University Press, 1994). ——Facing the Ocean: The Atlantic and its Peoples (Oxford: Oxford University Press, 2001).
K. Kristiansen, Europe before History (Cambridge: Cambridge University Press, 1998).
關於凱爾特人的一般書籍
B. Cunliffe, The Ancient Celts (Oxford: Oxford University Press, 1997).
M. J. Green (ed.), The Celtic World (London: Routledge, 1995).
J. Haywood, The Historical Atlas of the Celtic World (London: Thames and Hudson, 2001).
S. Moscati (ed.), The Celts (Milan: Bompiani, 1991).
希臘人和羅馬人眼中的凱爾特人
H. D. Rankin, Celts and the Classical World (London: Croom Helm, 1987).
凱爾特藝術
R. Megaw and V. Megaw, Celtic Art from its Beginnings to the Book of Kells (2nd edn., London: Thames and Hudson, 2001).
I. M. Stead, Celtic Art (London: British Museum, 1985).
凱爾特人的宗教
J. L. Brunaux, The Celtic Gauls: Gods, Rites and Sanctuaries (London: Seaby, 1988).
M. Green, The Gods of the Celts (Gloucester: Alan Sutton, 1968).
S. Piggott, The Druids (London: Thames and Hudson, 1968).
M.-L. Sjoestedt, Gods and Heroes of the Celts (Dublin: Four Courts Press, 1994).
島嶼方言文學
M. Dillon, Early Irish Literature (Chicago: University of Chicago Press, 1948).