Columbia subject headings:
English drama--20th century--Bibliography.
Shaffer, Anthony, 1926-2001--Bibliography.
Shaffer, Peter, 1926-2016--Bibliography.
Harvard subject headings:
English drama--20th century--Bibliography
Shaffer, Anthony, 1926-2001--Bibliography.
Shaffer, Peter, 1926---Bibliography.
Princeton subject headings:
English drama--20th century--Bibliography.
Shaffer, Anthony, 1926-2001--Bibliography.
Shaffer, Peter, 1926-2016--Bibliography.