APA (7th ed.) Citation

Metchnikoff, E., & Mitchell, P. C. (1903). The nature of man: Studies in optimistic philosophy. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

Metchnikoff, Elie, and P. Chalmers Mitchell. The Nature of Man: Studies in Optimistic Philosophy. New York and London: G.P. Putnam's Sons, 1903.

MLA (9th ed.) Citation

Metchnikoff, Elie, and P. Chalmers Mitchell. The Nature of Man: Studies in Optimistic Philosophy. G.P. Putnam's Sons, 1903.