UNESCO Statistical Yearbook, 1971. Paris: United Nations Educational, Scientific and Cultural Organization, 1972, 700-731.
United Nations Educational, Scientific and Cultural Organization. World Communications: Press, Radio, Television, Film. (4th ed.) New York: UNESCO, 1964.
United Nations. Office of Public Information. Press Section. "United Nations Bodies and Their Membership, 1972." (Press Release ORG/ 713.) May 1, 1972, 1-58.
U.S. Department of the Army. Communist Eastern Europe: Analytical Survey of Literature. (DA PAM 550-8.) Washington: GPO, 1971.
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.
"Aspects of New Constitution Interpreted," Novo Vreme, Sofia, January 1969, 1. (JPRS: 47,959, No. 93, 1969).
"Attention Called to Problems of Working Women," Trud, Sofia, March 14, 1972. (JPRS 55,798, No. 514, 1972).
"BCP Greetings Message Outlines Tasks of Bulgarian Propaganda," Sofia, December 3, 1971. (Speech by Georgi Bokov recorded on Sofia Radio.) (JPRS 54,763, No. 458, December 22, 1971).
"Book Publication Circumstances Criticized," Partien Zhivot, Sofia, II, February 1970. (JPRS 50,510, No. 197, March 25, 1970).
"Communist Party Courts Full Support of KOMSOMOL," Rabotnichesko Delo, Sofia, March 27, 1971. (JPRS 52,862, No. 339, 1971).