Columbia subject headings:
Communism--Soviet Union.
Gorbachev, Mikhail Sergeevich, 1931-
Soviet Union--Politics and government--1985-1991.
Harvard subject headings:
Communism--Soviet Union
Gorbachev, Mikhail Sergeevich, 1931-
Soviet Union--Politics and government--1985-1991.
Princeton subject headings:
Communism--Soviet Union.
Gorbachev, Mikhail Sergeevich, 1931-2022.
Soviet Union--Politics and government--1982-.