APA (7th ed.) Citation

Koestler, A. (1960). The watershed: A biography of Johannes Kepler. Anchor Books.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Watershed: A Biography of Johannes Kepler. Garden City, N.Y.: Anchor Books, 1960.

MLA (9th ed.) Citation

Koestler, Arthur. The Watershed: A Biography of Johannes Kepler. Anchor Books, 1960.

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