Thomas A. Carlson (ed.), "Cathedral of Edessa" in last modified August 9, 2017, http://syriaca.org/place/2927
   
      
         
            
               Cathedral of Edessa
               كنيسة الرها
               The main church of Edessa
               
               
                  Attestation of name كنيسة الرها in the 
                        Kitāb al-aʿlāq al-nafīsa of Aḥmad ibn ʿUmar Ibn Rustah.
                  
               
          
                  
                  
               
               http://syriaca.org/place/2927
               
                  Kitāb al-aʿlāq al-nafīsa
                  Aḥmad ibn ʿUmar Ibn Rustah
                  
                  83