APA (7th ed.) Citation

Duncan, D. (1908). Life and letters of Herbert Spencer. D. Appleton and Company.

Chicago Style (17th ed.) Citation

Duncan, David. Life and Letters of Herbert Spencer. New York: D. Appleton and Company, 1908.

MLA (9th ed.) Citation

Duncan, David. Life and Letters of Herbert Spencer. D. Appleton and Company, 1908.

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