Reference work entry
Part of the The Statesman's Yearbook book series (SYBK)

Further Reading

  1. Central Statistical Office. Statisticheski Godishnik.—Statisticheski Spravochnik (annual).—Statistical Reference Book of Republic of Bulgaria (annual).Google Scholar
  2. Crampton, Richard J., A Concise History of Bulgaria. 2nd ed. 2005Google Scholar
  3. National Statistical Office: Natsionalen Statisticheski Institut, 2 P. Volov St., 1038 Sofia.Google Scholar

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