Columbia subject headings:
Berdi︠a︡ev, Nikolaĭ, 1874-1948.
Ethics, Modern--20th century.
Ethics.
Harvard subject headings:
Berdi︠a︡ev, Nikolaĭ, 1874-1948--Contributions in ethics.
Ethics, Modern--20th century.
Princeton subject headings:
Berdi︠a︡ev, Nikolaĭ, 1874-1948.
Ethics, Modern--20th century.