Ph. Grierson, Catalogue of the Byzantine coins in the Dumbarton Oaks collection and in the Whittemore collection: 2, Phocas to Theodosius III (602-717), Part 2, Heraclius Constantine to Theodosius III (641-717), Washington D.C., Dumbarton Oaks research library and collection, 1993 (Dumbarton Oaks catalogues).
| 1, 12, p. 525, 530 |