Columbia subject headings:
Barker, Howard--Criticism and interpretation.
Dramatists, English--20th century.
English drama--20th century--History and criticism.
Harvard subject headings:
Barker, Howard--Criticism and interpretation.
Dramatists, English--20th century.
English drama--20th century--History and criticism
Princeton subject headings:
Barker, Howard--Criticism and interpretation.
Dramatists, English.
English drama--20th century--History and criticism.