APA (7th ed.) Citation

Darwin, C., & Burkhardt, F. (1996). Charles Darwin's letters: A selection, 1825-1859. University of Cambridge.

Chicago Style (17th ed.) Citation

Darwin, Charles, and Frederick Burkhardt. Charles Darwin's Letters: A Selection, 1825-1859. Cambridge ; New York, NY, USA: University of Cambridge, 1996.

MLA (9th ed.) Citation

Darwin, Charles, and Frederick Burkhardt. Charles Darwin's Letters: A Selection, 1825-1859. University of Cambridge, 1996.