ISBN 0-8047-2630-2* Яхъя Антиохийский, Летопись 1-6, 7-17* Detailed list of Bulgarian rulers (PDF)* John Skylitzes, "Synopsis Historion": "The Battle of Kleidion"* Catherine Holmes, "Basil II (A.D. 976-1025)"* Chronicle of the Priest of Duklja* Map of Europe in 1000.
ISBN 0-8047-2630-2==External links==* Летопис попа Дуклянина* Яхъя Антиохийский, Летопись 1-6, 7-17*Detailed list of Bulgarian rulers (PDF)*John Skylitzes, "Synopsis Historion": "The Battle of Kleidion"*Catherine Holmes, "Basil II (A.D. 976-1025)"*Chronicle of the Priest of Duklja*Map of Europe in 1000.