Title: Istorii︠a︡ Bolgarii.
Authors: Tretʹi︠a︡kov, P. N.; Institut slavi︠a︡novedenii︠a︡ (Akademii︠a︡ nauk SSSR)
Publisher: Izd-vo Akademii nauk SSSR,
Year: 1954
Subjects: Bulgaria History.