Popoff, Emil. "Bulgaria's Young: The Silent Nihilists," East Europe, XVII, No. 7, July 1968, 7-11.
Pounds, Norman J. G. Eastern Europe. Chicago: Aldine, 1969.
Rothschild, Joseph. Communist Eastern Europe. New York: Walker, 1964.
U.S. Department of Commerce. Office of Technical Services. Joint Publications Research Service—JPRS (Washington). The following items are from the JPRS series Translations on Eastern Europe: Political, Sociological, and Military Affairs.
"Bulgarian Criminal Code," Sbornik postanovleniya i razporezhdaniya na Ministerskiya suvet na NRB, Sofia, May 1968. (JPRS: 45,757, No. 5, 1968).
"Bulgarian Customs Operations," Otechestven Front, Sofia, 1971, (JPRS: 55,110, No. 475, 1972).
"Civil Defense Plans and Tasks," Narodna Armiya, Sofia, February 21, 1972. (JPRS: 58,495, No. 685, 1973).
"Crime Treatment in Socialist Society," Filosofska Misul, Sofia, 1971. (JPRS: 53,920, No. 405, 1971).
"Execution of Court Sentences," Durzhaven Vestnik, Sofia, April 15, 1969. (JPRS: 48,065, No. 98, 1969).
"History of Military Medical Institute," Voenno Meditsinsko Delo, Sofia, No. 5, 1970. (JPRS: 52,242, No. 308, 1971).