APA (7th ed.) Citation

Partridge, G. E. (1919). The psychology of nations: A contribution to the philosophy of history. Macmillan.

Chicago Style (17th ed.) Citation

Partridge, George Everett. The Psychology of Nations: A Contribution to the Philosophy of History. New York: Macmillan, 1919.

MLA (9th ed.) Citation

Partridge, George Everett. The Psychology of Nations: A Contribution to the Philosophy of History. Macmillan, 1919.