Columbia subject headings:
Harvard subject headings:
Belarusian literature--20th century--History and criticism.
Kolas, I︠A︡kub, 1882-1956--Criticism and interpretation.
Kupala, I︠A︡nka, 1882-1942--Criticism and interpretation.
Princeton subject headings:
Kolas, I︠A︡kub, 1882-1956--Criticism and interpretation.
Kupala, I︠A︡nka, 1882-1942--Criticism and interpretation.