Columbia subject headings:
Belarusian language--Foreign influences.
Polish language--Influence on Belarusian.
Russian language--Influence on Belarusian.
Harvard subject headings:
Belarusian language--History.
Princeton subject headings:
Belarusian language--Foreign influences.
Polish language--Influence on Belarusian.
Russian language--Influence on Belarusian.