Kaiser, Robert G., and Morgan, Dan. "Housing Blight Plagues Planners in East Europe," Washington Post, December 19, 1972, A1, A20.
Katsarova, Raina D. Dances of Bulgaria. New York: Crown, 1951.
Kossev, D.; Hristov, H.; and Angelov, D. A Short History of Bulgaria. Sofia: Foreign Languages Press, 1963.
Lauwerys, Joseph A., and Scanlon, David G. "Education in Cities," The World Year Book of Education, 1970. New York: Harcourt, Brace and World, 1970.
Manning, Clarence A., and Smal-Stocki, Roman. The History of Modern Bulgarian Literature. New York: Bookman Associates, 1960.
Mishev, Dimitur. The Bulgarians in the Past. New York: Arno Press, 1971.
Mladenov, Lyubomir. "International Recognition," Bulgaria Today [Sofia], XXI, No. 7, July 1972, 15.
Monov, Georgi. "Semi-Boarding Schools," Bulgaria Today [Sofia], XX, No. 8, August 1971, 7-8.
Morgan, Dan. "Bulgaria Moving Cautiously to Better U.S. Ties." Washington Post, March 29, 1973, A15.
Moser, Charles A. A History of Bulgarian Literature 1865-1944. New York: Humanities Press, 1972.