Sources
- Runciman, Steven: A history of the First Bulgarian Empire, G. Bell & Sons, London 1930 (online edition "Books about Macedonia", retrieved on 23.12.2008)
- Гюзелев, В. Кавханите и ичиргу-боилите на българското ханство-царство (VII-XI в.), Пловдив 2007, ISBN 978-954-91983-1-7
- Златарски, В. История на българската държава през средните векове, том I, част 1, София 1970 (цитиран по електронното издание в „Книги за Македония“, достъп от 2.1.2009)
- Острогорски, Г. История на византийската държава, София 1998, ISBN 954-8079-92-5
- Рънсиман, Ст. История на Първото българско царство, ИК „Иван Вазов“, София 1993
- Fine, J. The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, University of Michigan Press, 1991, ISBN 0-472-08149-7
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