The Celtic Realms.
By Myles Dillon and Nora K. Chadwick.
London: Weidenfeld & Nicolson, 1972.
This source is a good place to get background information on Celtic topics. Although the main focus is Irish Social History, there are also chapters that deal with both Celtic Religion and Mythology and Irish and Welsh literature. This work includes an index, illustrations, and a list of abbreviations. The plates include: photographic examples of Celtic coins, artefacts and art; maps; landmarks and ruins.