APA (7th ed.) Citation

Kepler, J., & Baumgardt, C. (1951). Johannes Kepler: Life and letters. Philosophical Library.

Chicago Style (17th ed.) Citation

Kepler, Johannes, and Carola Baumgardt. Johannes Kepler: Life and Letters. New York: Philosophical Library, 1951.

MLA (9th ed.) Citation

Kepler, Johannes, and Carola Baumgardt. Johannes Kepler: Life and Letters. Philosophical Library, 1951.

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