Ostoich, Peter D. The Bulgarian Communist Party—Builder of a People's Democratic State. Sofia: Sofia Press, 1970.
Perl, Lila. Yugoslavia, Romania, Bulgaria. Camden: Thomas Nelson, 1970.
Popoff, Emil. "Bulgaria's Young: The Silent Nihilists," East Europe, XVII, No. 7, July 1968, 7-11.
Rakowska-Harmstone, Teresa. "Patterns of Political Change." Pages 323-347 in Adam Bromke, and Teresa Rakowska-Harmstone (eds.), The Communist States in Disarray, 1965-71. Minneapolis: University of Minnesota Press, 1972.
Rothschild, Joseph. Communist Eastern Europe. New York: Walker, 1964.
——. The Communist Party of Bulgaria: Origins and Development, 1883-1936. New York: Columbia University Press, 1959.
Rusinov, Spas. Bulgaria: A Survey. Sofia: Sofia Press, 1969.
Schöpflin, George (ed.). The Soviet Union and Eastern Europe. New York: Praeger, 1970.
Sharp, Samuel L., and Fedlam, Fruzsina H. The Soviet Union and Eastern Europe, 1972. (The World Series.) Washington: Stryker-Post Publications, 1972.
Sokolski, Alexander. "A Glance at the New Bulgarian Films," Bulgaria Today [Sofia], XXI, No. 7, July 1972, 28-29.