Grierson, Philip..
Phocas to Theodosius III. 602 - 717. Vol. 2 ; Part 1.. Phocas and Heraclius  ( 602 - 641 ). . /

. - Washington : Dumbarton Oaks Research Library and Collection,  1993 
. - X, 383, 22 p.  30 cm. 
 - ((Cataloque oof the Byzantine coins in the Dumbarton Oak )
<br/><label>  ISBN: </label>0-88402-012-6