T A Sinclair 
Eastern Turkey 
An Architectural and Archaeological Survey, Volume III

In this third volume the regions covered are to the south and east of the Taurus range, beginning with the Upper and Lower Euphrates, which includes the Byzantine and Turkish buildings of Harput, Malatya and the Keban region, where there are also a number of churches and monastic sites. The following section, on the Tigris region, runs from the Taurus to the Tur 'Abdin, a historic centre of Syrian monasticism. In Diyarbakr and Mardin there are many important Christian and Islamic monuments. This was the centre of the medieval Artukid kingdom.