¹Hutton, Ronald. The Pagan Religions of the Ancient British Isles: Their Nature and Legacy. Oxford, UK: B. Blackwell, 1991. 159-60.
The author is here writing specifically of the Turoe Stone.

²"Castlestrange, County Roscommon" Home: Buildings of Ireland: National Inventory of Architectural Heritage. Web. 01 June 2011. <http://www.buildingsofireland.ie/niah/search.jsp?type=record&county=RO&regno=31941001>.

³Coffey, George. "Some Monuments of the La Tène Period Recently Discovered in Ireland." Proceedings of the Royal Irish Academy Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 24 (1902-1904): 262-63.

⁴"La Tène Culture" Wikipedia, the Free Encyclopedia. Web. 01 June 2011. <http://en.wikipedia.org/wiki/La_Tène_culture>.

⁵Coffey.

⁶A proposal to preserve the Turoe Stone in a museum met with local opposition. Archaeologist Robert Chapple presents a discussion of the different solutions here. A Facebook page encouraging government action has also been created.
Photographs of the Killycluggin Stone in situ c. 1975 may be seen here.

⁷Jackson, Kenneth Hurlstone. The Oldest Irish Tradition; a Window on the Iron Age. Cambridge [Eng.: University, 1964. 6-7.