Columbia subject headings:
Polish language--Grammar, Comparative--Russian.
Polish language--Morphology.
Russian language--Grammar, Comparative--Polish.
Harvard subject headings:
Polish language--Grammar, Comparative--Russian.
Polish language--Morphology.
Russian language--Grammar, Comparative--Polish.
Princeton subject headings:
Polish language--Grammar, Comparative--Russian.
Polish language--Morphology.
Russian language--Grammar, Comparative--Polish.