Modern library of Alexandria (BA), Cairo. Bibliotheca Alexandrina News, Conference about Penelope Delta at the BA, at 2009-05-04:[1]نسخة محفوظة 2020-03-14 في Wayback Machine
Marii︠a︡ Nikolaeva Todorova. Balkan identities. C. Hurst & Co. Publishers. مؤرشف من الأصل في 2016-05-06.
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Modern library of Alexandria (BA), Cairo. Bibliotheca Alexandrina News, Conference about Penelope Delta at the BA, at 2009-05-04:[1]نسخة محفوظة 2020-03-14 في Wayback Machine