Principia mathematica / by Alfred North Whitehead and Bertrand Russell. - Whitehead, Alfred North, 1861-1947. (OLS)http://pul/name/783; Russell, Bertrand, 1872-1970. (OLS)http://pul/name/15334 (Cambridge University Press, 1997)
Rist. della 2. ed. del 1927.
Bibliografia in nota.