APA (7th ed.) Citation

Whitehead, A. N., & Russell, B. (1927). Principia mathematica (2nd ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Whitehead, Alfred North, and Bertrand Russell. Principia Mathematica. 2nd ed. Cambridge: Cambridge University Press, 1927.

MLA (9th ed.) Citation

Whitehead, Alfred North, and Bertrand Russell. Principia Mathematica. 2nd ed. Cambridge University Press, 1927.