Dulo (English Wikipedia)

Golden, Peter B. (2012), Oq and Oğur~Oğuz* (PDF), Turkish and Middle Eastern Studies, Rutgers University, pp. footnote 37, archived from the original (PDF) on 2015-04-19

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Pohl 1998. Pohl, Walter (1998), "Conceptions of Ethnicity in Early Medieval Studies", in Lester K. Little; Barbara H. Rosenwein (eds.), Debating the Middle Ages: Issues and Readings, Blackwell Publishers, pp. 13–24

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Runciman 1930, p. 11, Book I. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 12, Book I. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 280, Appendix III. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 11–12; 281, Book I; Appendix III. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 11–12, 281, Book I. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 281, Appendix III. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 11–12, Book I. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Runciman 1930, p. 11–12, 280–281, Appendix III. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Zlatarski 1918, p. 79–80. Zlatarski, Vasil N. (1918). Medieval History of the Bulgarian State, Vol I: History of the First Bulgarian Empire, Part I: Age of Hun-Bulgar Domination (679-852) (in Bulgarian). Sofia: Science and Arts Publishers, 2nd Edition (Petar Petrov, Ed.), Zahari Stoyanov Publishers, 4th Edition, 2006. ISBN 954-739-928-4. {{cite book}}: ISBN / Date incompatibility (help)
Runciman 1930, p. 280–281, Appendix III. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.
Zlatarski 1918, p. 80. Zlatarski, Vasil N. (1918). Medieval History of the Bulgarian State, Vol I: History of the First Bulgarian Empire, Part I: Age of Hun-Bulgar Domination (679-852) (in Bulgarian). Sofia: Science and Arts Publishers, 2nd Edition (Petar Petrov, Ed.), Zahari Stoyanov Publishers, 4th Edition, 2006. ISBN 954-739-928-4. {{cite book}}: ISBN / Date incompatibility (help)
Runciman 1930, p. 2–24, Book I. Runciman, Steven (1930). A History of the First Bulgarian Empire. G. Bell & Sons, London.

web.archive.org (Global: 1^st place; English: 1^st place)

Golden, Peter B. (2012), Oq and Oğur~Oğuz* (PDF), Turkish and Middle Eastern Studies, Rutgers University, pp. footnote 37, archived from the original (PDF) on 2015-04-19

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Bowersock, G. W.; Brown, Peter; Grabar, Oleg (1999). Late Antiquity : A Guide to the Postclassical World. Cambridge, Mass.: Belknap Press of Harvard University Press. ISBN 0-674-51173-5. OCLC 41076344.
Luttwak, Edward (2009). "Bulghars and Bulgarians". The Grand Strategy of the Byzantine Empire. Cambridge, Mass.: Belknap Press of Harvard University Press. ISBN 978-0-674-05420-2. OCLC 648760614.

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