APA (7th ed.) Citation

Nicolson, H. (1963). Diplomacy (3rd ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Nicolson, Harold. Diplomacy. 3rd ed. London: Oxford University Press, 1963.

MLA (8th ed.) Citation

Nicolson, Harold. Diplomacy. 3rd ed. Oxford University Press, 1963.