Helena of Bulgaria, Empress of Serbia (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helena of Bulgaria, Empress of Serbia" in English language version.

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Purković 1975, p. 6. Purković, Miodrag Al (1975). Jelena: žena cara Dušana. Izdanje Srpske pravoslavne eparhije za zapadnu Evropu.
Purković 1975, p. 7. Purković, Miodrag Al (1975). Jelena: žena cara Dušana. Izdanje Srpske pravoslavne eparhije za zapadnu Evropu.
Đorđe Strizović (2004). Прошлост која живи. Доситеј. p. 169.
Fine 1994, pp. 346–347. Fine, John Van Antwerp Jr. (1994) [1987]. The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. Ann Arbor, Michigan: University of Michigan Press.
Ćirković 2004, p. 78. Ćirković, Sima (2004). The Serbs. Malden: Blackwell Publishing.