National Foreign Assessment Center (U.S.). (1979). USSR, trends and prospects in educational attainment, 1959-85. The Center.
Dyfyniad Arddull ChicagoNational Foreign Assessment Center (U.S.). USSR, Trends and Prospects in Educational Attainment, 1959-85. Washington: The Center, 1979.
Dyfyniad MLANational Foreign Assessment Center (U.S.). USSR, Trends and Prospects in Educational Attainment, 1959-85. The Center, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.