Entsiklopediya A-Ya
By: [glaven red.: Vladimir Iv. Georgiev].
Publisher: Izd-vo na Bǔlgarska Akademiya na Naukite
Published: 1974
Place of publication: Sofiya
Language: bul
Notes: At head oftitle: Bǔlgarska Akademiya na Naukite. Bǔlgarska entsiklopediya.