Grierson, Philip.
Leo III to Nicephorus III, 717-1081. Pt. 1 : Leo III to Michael III, (717-867) /
Philip Grierson 
. - Washington : Dumbarton Oaks Center for Byzantine Studies,  1973 
. - ix, 470, xxix p.  ill., tab.  30 cm. 
<br/><label>  ISBN: </label>0-88401-045-2