Битка при Ахелой (1359) (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Битка при Ахелой (1359)" in Bulgarian language version.

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Fine, John Van Antwerp. The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. University of Michigan Press, 1994. ISBN 0-472-08260-4. с. 348 – 51.
Nicol, Donald MacGillivray. The Byzantine family of Kantakouzenos (Cantacuzenus) ca. 1100 – 1460: a genealogical and prosopographical study. Т. 11. Dumbarton Oaks Center for Byzantine Studies, 1968. с. 132.