APA

Darwin C., . (1896). The life and letters of Charles Darwin. New York: D. Appleton and Company.

Chicago

Darwin Charles, . 1896. The life and letters of Charles Darwin. New York: D. Appleton and Company.

Harvard

Darwin C., . (1896). The life and letters of Charles Darwin. New York: D. Appleton and Company.

MLA

Darwin Charles, . The life and letters of Charles Darwin. New York: D. Appleton and Company. 1896.