- selishte. Sofii︠a︡ : Izd-vo na Bŭlgarskata akademii︠a︡ na naukite,
Arkheologicheski institut 1979 (excavation
report of Tell Ezero). Mallory, J. P.; Adams...
- 22-25.
Stone slab with Double-Headed Eagle,
Stara Zagora,
Nasionalen Arkheologicheski Muzei,
Sofia Inv. nr.B: 854; 10th-11th century, from the time of the...