APA (7th ed.) Citation

Koestler, A. (1976). The heel of Achilles: Essays, 1968-1973. Pan Books.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Heel of Achilles: Essays, 1968-1973. London: Pan Books, 1976.

MLA (8th ed.) Citation

Koestler, Arthur. The Heel of Achilles: Essays, 1968-1973. Pan Books, 1976.

Warning: These citations may not always be 100% accurate.