Nauchni biblioteki : teorii︠a︡ i praktika /

by Savova, Elena
Sofii︠a︡ : Izd-vo na Bŭlgarskata akademii︠a︡ na naukite, 1980

Nat︠s︡ionalnii︠a︡t bibliotechen fond po ezikovedna rusistika = The National library collection of the linguistics of Russian /

by Stanisheva, L. (Lazarina)
Sofii︠a︡ : Sofiĭski universitet "Kliment Okhridski," Universitetska biblioteka, 1985

Bibliotechnata sistema na BAN : problemi, sŭstoi͡anie, perspektivi /

by Savova, Elena
Sofii͡a : BAN, 1976