APA (7th ed.) Citation

Jeffreys, S. H. (1961). Theory pf probability (3d ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Jeffreys, Sir Harold. Theory Pf Probability. 3d ed. Oxford: Clarendon Press, 1961.

MLA (9th ed.) Citation

Jeffreys, Sir Harold. Theory Pf Probability. 3d ed. Clarendon Press, 1961.