The catalogue of Kimbell Art Museum's 1998 exhibition Ancient Gold: The Wealth of the Thracians indicates a historical extent of Thracian settlement including most of Ukraine, all of Hungary and parts of Slovakia. (Kimbell Art – Exhibitions)
nature.com
Nature (2019) Ancient human mitochondrial genomes from Bronze Age Bulgaria: new insights into the genetic history of Thracians
Tonkova, Milenka (2010). »On human sacrifice in Thrace (on archaeological evidence)«. V Cândea, Ionel; Sîrbu, Valeriu (ur.). Tracii şi vecinii lor în antichitate. Ed. Istros a Muzeului Brăilei. str. 503–514. ISBN978-973-1871-58-5. OCLC844101517.
Archibald, Zofia (1998). The Odrysian Kingdom of Thrace: Orpheus Unmasked. Clarendon Press. str. 100. ISBN978-0-19-815047-3. OCLC1000881553.