Williams

Williams, R. Silver Coinage of Velia. (London, 1992).
Williams, R. Silver Coinage of the Phokians. (London, 1972). (freely available online at the RNS)
Williams, R. "The archaic coinage of Arcadian Heraea" in ANSMN XVI (1970).
Williams, R. The Confederate Coinage of the Arcadians in the Fifth Century BC. ANSNNM 155 (1965). (available at JSTOR)