Catalogue of the byzantine coins in the Dumbarton Oaks Collection and in the Whittemore Collection / Vol. 3. Leo III to Nicephorus III, 717 - 1081 P. 1 Leo III to Michael III ; (717 - 867) / by Philip Grierson - Grierson, Philip (Catalogue of the byzantine coins in the Dumbarton Oaks Collection and in the Whittemore Collection, 1993)