Corpus Vasorum Antiquorum http://www.cvaonline.org/cva
Beazley Archive Pottery Database http://www.beazley.ox.ac.uk/pottery/default.htm
Archaeologia Bulgarica https://www.archaeologia-bulga
Municipal Cultural Institute “Museum Center” – Sozopol https://sozopol-museums.bg/en/
Θρακικός Ηλεκτρονικός Θησαυρός http://www.xanthi.ilsp.gr/thraki
Θρακική Εστία http://www.thrakikh-estia.gr/
Foundation of the Hellenic World http://www.fhw.gr/chronos/06/gr/culture/index702.html
Regional Guide of Eastern Macedonian and Thrace http://www.ipet.gr/cultureportalweb
Ministry of Culture and Sports http://odysseus.culture.gr
Photos credit
https://commons.wikimedia.org/wiki/File:Polychrome_vase,_AM_Sozopol,_Sozm18.jpg attribution: Zde [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], from Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Red-figure_Attic_cup,_young_horseman,_400-350_BC,_AM_Varna,_Varm31.jpg attribution: Zde [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], from Wikimedia Commons
http://bulgariatravel.org/data/media/028_003_Arheologicheski_muzej_Sozopol.jpg.jpg
http://bulgariatravel.org/data/media/067_009_Arheologicheski_muzej_Nesebyr.jpg.jpg