Jeffreys, S. H. (1961). Theory pf probability (3d ed.). Clarendon Press.
Lua i Stíl Chicago (17ú heag.)Jeffreys, Sir Harold. Theory Pf Probability. 3d ed. Oxford: Clarendon Press, 1961.
Lua MLA (9ú heag.)Jeffreys, Sir Harold. Theory Pf Probability. 3d ed. Clarendon Press, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.