Helena Ducas Ángelo (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helena Ducas Ángelo" in Spanish language version.

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google.com.pe

books.google.com.pe

Polemis, 1968, p. 97. Polemis, Demetrios I. (1968). The Doukai: A Contribution to Byzantine Prosopography (en inglés). Londres: The Athlone Press. OCLC 299868377.

worldcat.org

Polemis, 1968, p. 97. Polemis, Demetrios I. (1968). The Doukai: A Contribution to Byzantine Prosopography (en inglés). Londres: The Athlone Press. OCLC 299868377.