Columbia subject headings:
Bonsels, Waldemar, 1880 or 1881-1952--Criticism and interpretation.
Harvard subject headings:
Bonsels, Waldemar, 1880 or 1881-1952--Criticism and interpretation.
Princeton subject headings:
Bonsels, Waldemar, 1880 or 1881-1952--Criticism and interpretation.