Atkins, John: Arthur Koestler. London, 1956. Neville Spearman; New York, 1956. Roy Publishers.
1962
Huber, Peter Alfred: Arthur Koestler. Das literarische Werk. Zürich, 1962. Fretz & Wasmuth.
1968
Calder, Jenni: Chronicles of Conscience. A Study of George Orwell and Arthur Koestler. London, 1968. Secker & Warburg; University of Pittsburgh Press, 1968.
1973
Mays, Wolfe: Arthur Koestler (Makers of modern thought). Guilford, 1973. Lutterworth Press; Pennsylvania, 1973. Judson Press.
1975
Harris, Harold: Astride the Two Cultures. Arthur Koestler at 70. London, 1975. Hutchinson; New York, 1976, Random.
1977
Sperber, Murray A.: Arthur Koestler. A Collection of Critical Essays. Englewood Cliffs , 1977. Prentice Hall.
1978
Pearson, Sidney: Arthur Koestler. Boston, 1978. Twayne Publishers.
1979
Merrill, Red–Frazier, Thomas: Arthur Koestler. An International Bibliography. Woodstock, 1979. Ardis.
1982
Hamilton, Iain: Koestler. A Biography. London, 1982. Secker&Warburg.
1983
Mikes, George: Arthur Koestler. The Story of a Friendship. London, 1983. André Deutsch.
1984
Levene, Mark: Arthur Koestler. Ungar Pub Co. (1 December 1984); London, 1985. Hardcover.
1985
Living with Koestler. Mamaine Koestler’s Letters 1945–1951. Edited by Celia Goodman. London, 1985. Weidenfeld and Nicholson; New York, 1985. St. Martin’s Press.
1987
Day, Frank: Arthur Koestler. A Guide to Research. New York–London, 1987. Garland Publishing 1987.
Debray-Ritzen, Pierre: Arthur Koestler. Un croise sans croix. 1987. L’Herne.
Komuth, Horst: Manès Sperber, Arthur Koestler und George Orwell. Der Totalitarismus als Geissel des 20. Jahrhunderts. Würzburg, 1987. Creator. (Neue Würzburger Studien zur Soziologie)
1990
Quillot, Roland: Arthur Koestler. De la desillusion tragique au rève d’une nouvelle synthèse. Paris, 1990.
1998
Cesarani, David: Arthur Koestler. The Homeless Mind. London, 1998. Heinemann.
2004
Buckard, Christian: Arhur Koestler. Ein extremes Leben 1905–1983. München, 2004, C. H. Beck.
2005
Laval, Michel: L’homme sans concessions. Arthur Koestler et son siècle. Paris, 2005. Calmann-Lévy.