Entsiklopediya B"lgariya
By: gl. red. Vladimir Georgiev. T.4 M-O.
Contributors: Georgiev, Vladimir.; B"lgarska akademiya na nuakite.
Publisher: Izdatel'stvo na B"lgarskata akademiya na naukite
Published: 1978
Place of publication: Sofiya
Language: bul
Number of pages: 799