^Raftery, Barry. O Croinin, Daibhi , 编. Iron-age Ireland. Oxford University Press. 2005: 134–181. ISBN 978-0-19-821737-4.
^Fitzpatrick (1996) page 242: "It is clear, then, that there is no intrinsic 'Celtic' European unity and that the idea of 'Celtic' Iron Age Europe has developed in an almost ad hoc fashion. When examined critically the central idea – of being 'Celtic' – may also be seen to be weakly formulated ...."
^Cunliffe (2005) page 652. The dates are the mid-points of Cunliffe's transitional lines. His earliest and latest possibilities have been used for the end points. In the text 750 BC is his summary date for the beginning.
Cunliffe, Barry W. Iron Age Communities in Britain, Fourth Edition: An Account of England, Scotland and Wales from the Seventh Century BC Until the Roman Conquest. Routledge. 2005. ISBN 0-415-34779-3.
Fitzpatrick, Andrew P. 'Celtic' Iron Age Europe: the theoretical basis. Graves-Brown, Paul; Jones, Siân; Gamble, Clive (编). Cultural Identity and Archaeology: The Construction of European Communities. Routledge. 1996: 238–255. ISBN 978-0-415-10676-4.