Columbia subject headings:
Harvard subject headings:
English drama--19th century--Bibliography.
English drama--19th century--History and criticism--Bibliography.
English drama--20th century--Bibliography
English drama--20th century--History and criticism--Bibliography.
Princeton subject headings:
English drama--19th century--Bibliography.
English drama--19th century--History and criticism--Bibliography.
English drama--20th century--Bibliography.
English drama--20th century--History and criticism--Bibliography.