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บรรณานุกรม

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• Bakalov, Georgi (1995). The Medieval Bulgarian Ruler (Title and Insignia) (in Bulgarian). Sofia.CS1 maint: unrecognized language (link)
• Ivanov, Yordan (1970). Bulgarian Antiquities from Macednia (in Bulgarian). Sofia: BAN.CS1 maint: unrecognized language (link)
• Laskaris, M. (1930). Bulgarian Antiquities (Book XI). The Vatopedi Charter of Emperor Ivan Asen II (in Bulgarian). Sofia: BAN, Darzhavna Pechatnitsa.CS1 maint: unrecognized language (link)
• Runciman, Steven (1930). A History of the First Bulgarian Empire. London: George Bell & Sons. OCLC 832687.
• Stephenson, Paul (2004). Byzantium's Balkan Frontier. A Political Study of the Northern Balkans (900–1204). Cambridge: Cambridge University Press. ISBN 0-511-03402-4.
• Whittow, Mark (1996). The Making of Byzantium (600–1025). Los Angeles: University of California Press. ISBN 0-520-20497-2.
• Zlatarski, Vasil (1971) [1927]. History of the Bulgarian state in the Middle Ages. Volume I. History of the First Bulgarian Empire (in Bulgarian) (2 ed.). Sofia: Nauka i izkustvo. OCLC 67080314.CS1 maint: unrecognized language (link)