Columbia subject headings:
Authors, English--20th century--Biography.
Koestler, Arthur, 1905-1983--Criticism and interpretation.
Koestler, Arthur, 1905-1983.
Harvard subject headings:
Koestler, Arthur, 1905-1983--Criticism and interpretation.
Princeton subject headings:
Authors, English--20th century--Biography.
Koestler, Arthur, 1905-1983.