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Balkans : A history of Bulgaria, Serbia, Greece, Rumania, Turkey / by Nevill Forbes ... [et al.]. 1915.

Bulgarian Historical Review (2005), United Center for Research and Training in History, Published by Pub. House of the Bulgarian Academy of Sciences, v. 33:no. 1–4.

History of Bulgaria / Hristo Hristov ; [translated from the Bulgarian, Stefan Kostov ; editor, Dimiter Markovski]. Khristov, Khristo Angelov,. c1985.

History of Bulgaria, 1393–1885 / [by] Mercia MacDermott. MacDermott, Mercia, 1927–[1962].

Concise history of Bulgaria / R.J. Crampton. Crampton, R. J. 1997.

Short history of Bulgaria / [by] D. Kossev, H. Hristov [and] D. Angelov ; [Translated by Marguerite Alexieva and Nicolai Koledarov ; illustrated by Ivan Bogdanov [and] Vladislav Paskalev]. Kossev, D. 1963.

Short history of Bulgaria / Nikolai Todorov ; [L. Dimitrova, translator]. Todorov, Nikolai, 1921–1975.

12 Myths in Bulgarian History/ [by] Bozhidar Dimitrov; Published by "KOM Foundation," Sofia, 2005.

The 7th Ancient Civilizations in Bulgaria [The Golden Prehistoric Civilization, Civilization of Thracians and Macedonians, Hellenistic Civilization, Roman [Empire] Civilization, Byzantine [Empire] Civilization, Bulgarian Civilization, Islamic Civilization] [by] Bozhidar Dimitrov; Published by "KOM Foundation," Sofia, 2005 (108 p.)

Jordan Andreev, Ivan Lazarov, Plamen Pavlov, Koj koj e v srednovekovna Bălgarija, Sofia 1999.

John Skylitzes II, 455, 13

Helene Ahrweiler, Les Europeens, pp. 150, Herman (Paris), 2000.

Runciman, Steven (1929) The Emperor Romanus Lecapenus and His Reign. Cambridge.

Woodhouse 1986, 109; Sp. Lambros, Argyropouleia, Athens 1910, 7,29

Edward Gibbon, Decline and Fall of the Roman Empire, chapter 53.