Cita APA (7a ed.)

Whitehead, A. N., & Russell, B. (1968). Principia mathematica (2nd ed.). University Press.

Cita Chicago Style (17a ed.)

Whitehead, Alfred North, y Bertrand Russell. Principia Mathematica. 2nd ed. Cambridge [etc.]: University Press, 1968.

Cita MLA (9a ed.)

Whitehead, Alfred North, y Bertrand Russell. Principia Mathematica. 2nd ed. University Press, 1968.