Cita APA (7th ed.)

Whitehead, A. N. (1927). Principia mathematica (2nd ed.). C.U.Pr.

Cita Chicago (17th ed.)

Whitehead, Alfred North. Principia Mathematica. 2nd ed. Cambridge: C.U.Pr, 1927.

Cita MLA (9th ed.)

Whitehead, Alfred North. Principia Mathematica. 2nd ed. C.U.Pr, 1927.