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Reference book 1969.

APA Citation

Bŭlgarska akademii͡a na naukite. (1969). Reference book 1969. Sofia: Publishing House of the Bulgarian Academy of Sciences.

Bŭlgarska akademii͡a na naukite. Reference Book 1969. Sofia: Publishing House of the Bulgarian Academy of Sciences, 1969.

Warning: These citations may not always be complete (especially for serials).