APA (7th ed.) Citation

Koestler, A., & Kepler, J. (1960). The watershed: A biography of Johannes Kepler. Heinemann.

Chicago Style (17th ed.) Citation

Koestler, Arthur, and Johannes Kepler. The Watershed: A Biography of Johannes Kepler. [London]: Heinemann, 1960.

MLA (9th ed.) Citation

Koestler, Arthur, and Johannes Kepler. The Watershed: A Biography of Johannes Kepler. Heinemann, 1960.

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