See S. Runciman, A History of the First Bulgarian Empire (1930); M. MacDermott, A History of Bulgaria, 1393–1885 (1962); J. F. Brown, Bulgaria under Communist Rule (1970); F. Schevill, A History of the Balkan Peninsula (1922, repr. 1971); J. D. Bell, The Bulgarian Communist Party from Blagoev to Zhivkov (1985); J. R. Lampe, The Bulgarian Economy in the Twentieth Century (1986).
