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== Viri ==
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* John V.A. Fine, Jr., ''The Late Medieval Balkans'', Ann Arbor, 1987
* Niketas Choniates, ''Nicetae Choniatae Historia'', Bonn, 1835, (primarni vir)
* Magoulias,Niketas Harry JChoniates., O''Nicetae CityChoniatae of ByzantiumHistoria'', Annals of Niketas ChoniatesBonn, 1984, ISBN 0-8143-1764-21835, (primarni vir)
* AnsbertMagoulias, Harry J.O. ''HistoriaCity deof expeditione Friderici imperatorisByzantium'', MonumentaAnnals Germaniaeof Historica,Niketas ScriptoresChoniates, n.s. 51984, 15ISBN 0-8143-1764-702, (primarni vir)
* Ansbert. ''Historia de expeditione Friderici imperatoris'', Monumenta Germaniae Historica, Scriptores, n.s. 5, 15-70, (primarni vir)
* Mauro Orbini,. ''Il Regno di Slavi'', Pesaro, 1601
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