APA (7th ed.) Citation

Jeffreys, H. (1948). Theory of probability (2. ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Jeffreys, Harold. Theory of Probability. 2. ed. Oxford: Clarendon Press, 1948.

MLA (9th ed.) Citation

Jeffreys, Harold. Theory of Probability. 2. ed. Clarendon Press, 1948.