APA (7th ed.) Citation

Darwin, C., Darwin, F., & Seward, A. C. (1903). More letters of Charles Darwin: A record of his work in a series of hitherto unpublished letters. Appleton.

Chicago Style (17th ed.) Citation

Darwin, Charles, Francis Darwin, and A. C. Seward. More Letters of Charles Darwin: A Record of His Work in a Series of Hitherto Unpublished Letters. New York: Appleton, 1903.

MLA (8th ed.) Citation

Darwin, Charles, et al. More Letters of Charles Darwin: A Record of His Work in a Series of Hitherto Unpublished Letters. Appleton, 1903.