APA (7th ed.) Citation

Koestler, A. (1961). The watershed: A biography of Johannes Kepler. Heinemann.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Watershed: A Biography of Johannes Kepler. London: Heinemann, 1961.

MLA (8th ed.) Citation

Koestler, Arthur. The Watershed: A Biography of Johannes Kepler. Heinemann, 1961.

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