Celtic Coin Book References:
S =
Coins of England and the United Kingdom M = R P Mack,
The Coinage of Ancient Britain VA = R D Van Arsdell,
Celtic Coinage in Britain BMC = D Allen & R Hobbs,
British Museum Catalogues GEB = J Sills,
Gaulish and Early British Gold Coinage LT = S Gouet, M Prieur & L Schmitt,
La Tour CCI =
Celtic Coin Index at Oxford University WW =
Wildwinds.com (reference & attribution site) 
