Пресијан: Разлика помеѓу преработките

* [[Иван Божилов]], ''Фамилията на Асеневци (1186–1460).'' София 1985.

* John V. A. Fine, Jr., ''The Early Medieval Balkans''. Ann Arbor: University of Michigan Press 1991. ISBN 978-0-472-08149-3.

* Gerhard Podskalsky, Theologische ''Literatur des Mittelalters in Bulgarien und Serbien 815-1459''. München 2000. ISBN 3-406-45024-5

* {{cite book | last=Bury | first= J. B. | title=History of the Eastern Empire from the Fall of Irene to the Accession of Basil: A.D. 802-867 | isbn=1-60520-421-8 | year=2008 | url=http://books.google.com/?id=svPkt-TIHK0C&pg=PA372 | ref=harv}}