Metcalf, W.E. The Silver Coinage of Cappadocia, Vespasian-Commodus. ANSNNM 166. (New York, 1996).

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Also see:

References by William E. Metcalf
Hahn and Metcalf
Metcalf Cistophori
Metcalf Tell Kalak

References by David Michael Metcalf
Metcalf Balkans
Metcalf Crusaders
Metcalf Jerusalem
Metcalf Latin Imitative
Metcalf MN XX
Metcalf Origins
Metcalf Seals