APA (7th ed.) Citation

Korff, S. A. (1922). Russia's foreign relations during the last half century. Macmillan.

Chicago Style (17th ed.) Citation

Korff, S. A. Russia's Foreign Relations During the Last Half Century. New York: Macmillan, 1922.

MLA (9th ed.) Citation

Korff, S. A. Russia's Foreign Relations During the Last Half Century. Macmillan, 1922.